20057440 has 48 divisors (see below), whose sum is σ = 51036048. Its totient is φ = 7405056.

The previous prime is 20057437. The next prime is 20057459. The reversal of 20057440 is 4475002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2742 + ... + 6901.

It is an arithmetic number, because the mean of its divisors is an integer number (1063251).

Almost surely, 2^20057440 is an apocalyptic number.

20057440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20057440 is an abundant number, since it is smaller than the sum of its proper divisors (30978608).

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

20057440 is a wasteful number, since it uses less digits than its factorization.

20057440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9671 (or 9663 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20057440 is about 4478.5533378536. The cubic root of 20057440 is about 271.7013735293.

The spelling of 20057440 in words is "twenty million, fifty-seven thousand, four hundred forty".