20426256 has 50 divisors (see below), whose sum is σ = 59123262. Its totient is φ = 6808320.

The previous prime is 20426251. The next prime is 20426267. The reversal of 20426256 is 65262402.

It can be written as a sum of positive squares in only one way, i.e., 18352656 + 2073600 = 4284^2 + 1440^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426251) 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, 6585 + ... + 9176.

Almost surely, 2^20426256 is an apocalyptic number.

It is an amenable number.

20426256 is an abundant number, since it is smaller than the sum of its proper divisors (38697006).

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

20426256 is a wasteful number, since it uses less digits than its factorization.

20426256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15781 (or 15766 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20426256 is about 4519.5415696727. The cubic root of 20426256 is about 273.3566164316.

Adding to 20426256 its reverse (65262402), we get a palindrome (85688658).

The spelling of 20426256 in words is "twenty million, four hundred twenty-six thousand, two hundred fifty-six".