20056840 has 32 divisors (see below), whose sum is σ = 45279000. Its totient is φ = 7995904.

The previous prime is 20056811. The next prime is 20056847. The reversal of 20056840 is 4865002.

It can be written as a sum of positive squares in 4 ways, for example, as 16499844 + 3556996 = 4062^2 + 1886^2 .

It is not an unprimeable number, because it can be changed into a prime (20056847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14916 + ... + 16204.

Almost surely, 2^20056840 is an apocalyptic number.

20056840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20056840 is an abundant number, since it is smaller than the sum of its proper divisors (25222160).

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

20056840 is a wasteful number, since it uses less digits than its factorization.

20056840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689 (or 1685 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20056840 is about 4478.4863514362. The cubic root of 20056840 is about 271.6986642694.

The spelling of 20056840 in words is "twenty million, fifty-six thousand, eight hundred forty".