20557632 has 28 divisors (see below), whose sum is σ = 54392576. Its totient is φ = 6852480.

The previous prime is 20557627. The next prime is 20557633. The reversal of 20557632 is 23675502.

It is a self number, because there is not a number n which added to its sum of digits gives 20557632.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53344 + ... + 53727.

It is an arithmetic number, because the mean of its divisors is an integer number (1942592).

Almost surely, 2^20557632 is an apocalyptic number.

It is an amenable number.

20557632 is an abundant number, since it is smaller than the sum of its proper divisors (33834944).

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

20557632 is a wasteful number, since it uses less digits than its factorization.

20557632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107086 (or 107076 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 20557632 is about 4534.0524919767. The cubic root of 20557632 is about 273.9414157165.

The spelling of 20557632 in words is "twenty million, five hundred fifty-seven thousand, six hundred thirty-two".