20426656 has 24 divisors (see below), whose sum is σ = 42581700. Its totient is φ = 9612288.

The previous prime is 20426647. The next prime is 20426689. The reversal of 20426656 is 65662402.

It can be written as a sum of positive squares in 2 ways, for example, as 20394256 + 32400 = 4516^2 + 180^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18231 + ... + 19318.

Almost surely, 2^20426656 is an apocalyptic number.

It is an amenable number.

20426656 is an abundant number, since it is smaller than the sum of its proper divisors (22155044).

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

20426656 is a wasteful number, since it uses less digits than its factorization.

20426656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37576 (or 37568 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20426656 is about 4519.5858217319. The cubic root of 20426656 is about 273.3584007679.

The spelling of 20426656 in words is "twenty million, four hundred twenty-six thousand, six hundred fifty-six".