20345256 has 40 divisors (see below), whose sum is σ = 56987370. Its totient is φ = 6781536.

The previous prime is 20345251. The next prime is 20345261. The reversal of 20345256 is 65254302.

20345256 is a `hidden beast` number, since 203 + 452 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (20345251) and next prime (20345261).

It can be written as a sum of positive squares in only one way, i.e., 17892900 + 2452356 = 4230^2 + 1566^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20345251) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15051 + ... + 16346.

Almost surely, 2^20345256 is an apocalyptic number.

It is an amenable number.

20345256 is an abundant number, since it is smaller than the sum of its proper divisors (36642114).

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

20345256 is a wasteful number, since it uses less digits than its factorization.

20345256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31415 (or 31402 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20345256 is about 4510.5715824051. The cubic root of 20345256 is about 272.9948072916.

Adding to 20345256 its reverse (65254302), we get a palindrome (85599558).

The spelling of 20345256 in words is "twenty million, three hundred forty-five thousand, two hundred fifty-six".