20915732 has 12 divisors (see below), whose sum is σ = 38529120. Its totient is φ = 9907416.

The previous prime is 20915723. The next prime is 20915743. The reversal of 20915732 is 23751902.

It is a junction number, because it is equal to n+sod(n) for n = 20915695 and 20915704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137528 + ... + 137679.

It is an arithmetic number, because the mean of its divisors is an integer number (3210760).

Almost surely, 2^20915732 is an apocalyptic number.

It is an amenable number.

20915732 is a deficient number, since it is larger than the sum of its proper divisors (17613388).

20915732 is a wasteful number, since it uses less digits than its factorization.

20915732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275230 (or 275228 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20915732 is about 4573.3720600887. The cubic root of 20915732 is about 275.5228927302.

The spelling of 20915732 in words is "twenty million, nine hundred fifteen thousand, seven hundred thirty-two".