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20420412 = 22323241307
BaseRepresentation
bin100110111100…
…1011100111100
31102102110112120
41031321130330
520211423122
62005402540
7335366505
oct115713474
942373476
1020420412
1110588181
126a09450
1342cc8ac
1429d7bac
151bd575c
hex137973c

20420412 has 48 divisors (see below), whose sum is σ = 50088192. Its totient is φ = 6462720.

The previous prime is 20420377. The next prime is 20420443. The reversal of 20420412 is 21402402.

It is a junction number, because it is equal to n+sod(n) for n = 20420391 and 20420400.

It is a congruent number.

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, 66363 + ... + 66669.

It is an arithmetic number, because the mean of its divisors is an integer number (1043504).

Almost surely, 220420412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20420412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25044096).

20420412 is an abundant number, since it is smaller than the sum of its proper divisors (29667780).

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

20420412 is a wasteful number, since it uses less digits than its factorization.

20420412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20420412 is about 4518.8949976737. The cubic root of 20420412 is about 273.3305446209.

Adding to 20420412 its reverse (21402402), we get a palindrome (41822814).

The spelling of 20420412 in words is "twenty million, four hundred twenty thousand, four hundred twelve".

Divisors: 1 2 3 4 6 12 23 46 69 92 138 241 276 307 482 614 723 921 964 1228 1446 1842 2892 3684 5543 7061 11086 14122 16629 21183 22172 28244 33258 42366 66516 73987 84732 147974 221961 295948 443922 887844 1701701 3403402 5105103 6806804 10210206 20420412