20056440 has 64 divisors (see below), whose sum is σ = 60464160. Its totient is φ = 5322240.

The previous prime is 20056433. The next prime is 20056453. The reversal of 20056440 is 4465002.

It is a happy number.

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, 47430 + ... + 47850.

Almost surely, 2^20056440 is an apocalyptic number.

20056440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20056440 is an abundant number, since it is smaller than the sum of its proper divisors (40407720).

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

20056440 is a wasteful number, since it uses less digits than its factorization.

20056440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20056440 is about 4478.4416932679. The cubic root of 20056440 is about 271.6968580662.

The spelling of 20056440 in words is "twenty million, fifty-six thousand, four hundred forty".