20915632 has 20 divisors (see below), whose sum is σ = 40631080. Its totient is φ = 10430208.

The previous prime is 20915597. The next prime is 20915651. The reversal of 20915632 is 23651902.

It is a self number, because there is not a number n which added to its sum of digits gives 20915632.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5419 + ... + 8437.

It is an arithmetic number, because the mean of its divisors is an integer number (2031554).

Almost surely, 2^20915632 is an apocalyptic number.

It is an amenable number.

20915632 is a deficient number, since it is larger than the sum of its proper divisors (19715448).

20915632 is a wasteful number, since it uses less digits than its factorization.

20915632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3460 (or 3454 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20915632 is about 4573.3611272236. The cubic root of 20915632 is about 275.5224536296.

The spelling of 20915632 in words is "twenty million, nine hundred fifteen thousand, six hundred thirty-two".