20057550 has 24 divisors (see below), whose sum is σ = 49743096. Its totient is φ = 5348640.

The previous prime is 20057549. The next prime is 20057551. The reversal of 20057550 is 5575002.

It is an interprime number because it is at equal distance from previous prime (20057549) and next prime (20057551).

It is a self number, because there is not a number n which added to its sum of digits gives 20057550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20057551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66709 + ... + 67008.

It is an arithmetic number, because the mean of its divisors is an integer number (2072629).

Almost surely, 2^20057550 is an apocalyptic number.

20057550 is an abundant number, since it is smaller than the sum of its proper divisors (29685546).

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

20057550 is a wasteful number, since it uses less digits than its factorization.

20057550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133732 (or 133727 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 24.

The square root of 20057550 is about 4478.5656185882. The cubic root of 20057550 is about 271.7018702211.

The spelling of 20057550 in words is "twenty million, fifty-seven thousand, five hundred fifty".