20815932 has 24 divisors (see below), whose sum is σ = 48771072. Its totient is φ = 6910000.

The previous prime is 20815919. The next prime is 20815933. The reversal of 20815932 is 23951802.

It is a happy number.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20815932.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20815933) 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, 444 + ... + 6467.

It is an arithmetic number, because the mean of its divisors is an integer number (2032128).

Almost surely, 2^20815932 is an apocalyptic number.

It is an amenable number.

20815932 is an abundant number, since it is smaller than the sum of its proper divisors (27955140).

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

20815932 is a wasteful number, since it uses less digits than its factorization.

20815932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7169 (or 7167 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20815932 is about 4562.4480271012. The cubic root of 20815932 is about 275.0839721524.

The spelling of 20815932 in words is "twenty million, eight hundred fifteen thousand, nine hundred thirty-two".