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20420144403240 = 2335241706090747
BaseRepresentation
bin1001010010010011011110…
…11101000001001100101000
32200022010221222021120220110
410221021233131001030220
510134030423431400430
6111232515042454320
74205210133356331
oct451115735011450
980263858246813
1020420144403240
11656315318877a
1223596890643a0
13b517c41b92ba
145084a9975288
152562950217b0
hex12926f741328

20420144403240 has 64 divisors (see below), whose sum is σ = 61514625965760. Its totient is φ = 5422776929280.

The previous prime is 20420144403233. The next prime is 20420144403413. The reversal of 20420144403240 is 4230444102402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20420144403198 and 20420144403207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353016454 + ... + 353074293.

It is an arithmetic number, because the mean of its divisors is an integer number (961166030715).

Almost surely, 220420144403240 is an apocalyptic number.

20420144403240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20420144403240 is an abundant number, since it is smaller than the sum of its proper divisors (41094481562520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20420144403240 is a wasteful number, since it uses less digits than its factorization.

20420144403240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706091002 (or 706090998 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 20420144403240 its reverse (4230444102402), we get a palindrome (24650588505642).

The spelling of 20420144403240 in words is "twenty trillion, four hundred twenty billion, one hundred forty-four million, four hundred three thousand, two hundred forty".

Divisors: 1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120 241 482 723 964 1205 1446 1928 2410 2892 3615 4820 5784 7230 9640 14460 28920 706090747 1412181494 2118272241 2824362988 3530453735 4236544482 5648725976 7060907470 8473088964 10591361205 14121814940 16946177928 21182722410 28243629880 42365444820 84730889640 170167870027 340335740054 510503610081 680671480108 850839350135 1021007220162 1361342960216 1701678700270 2042014440324 2552518050405 3403357400540 4084028880648 5105036100810 6806714801080 10210072201620 20420144403240