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20405335257 = 327997295871
BaseRepresentation
bin10011000000010000…
…001011010011011001
31221200002020102200200
4103000100023103121
5313242231212012
613212445052413
71321443326226
oct230020132331
957602212620
1020405335257
11872130943a
123b55857109
131c02666798
14db807894d
157e66353dc
hex4c040b4d9

20405335257 has 24 divisors (see below), whose sum is σ = 30155274240. Its totient is φ = 13292847360.

The previous prime is 20405335217. The next prime is 20405335267. The reversal of 20405335257 is 75253350402.

20405335257 is a `hidden beast` number, since 20 + 4 + 0 + 533 + 52 + 57 = 666.

It is not a de Polignac number, because 20405335257 - 26 = 20405335193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20405335207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78969 + ... + 216902.

It is an arithmetic number, because the mean of its divisors is an integer number (1256469760).

Almost surely, 220405335257 is an apocalyptic number.

It is an amenable number.

20405335257 is a deficient number, since it is larger than the sum of its proper divisors (9749938983).

20405335257 is a wasteful number, since it uses less digits than its factorization.

20405335257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296053 (or 296050 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 36.

Adding to 20405335257 its reverse (75253350402), we get a palindrome (95658685659).

The spelling of 20405335257 in words is "twenty billion, four hundred five million, three hundred thirty-five thousand, two hundred fifty-seven".

Divisors: 1 3 9 79 97 237 291 711 873 7663 22989 68967 295871 887613 2662839 23373809 28699487 70121427 86098461 210364281 258295383 2267259473 6801778419 20405335257