20918732 has 6 divisors (see below), whose sum is σ = 36607788. Its totient is φ = 10459364.

The previous prime is 20918701. The next prime is 20918741. The reversal of 20918732 is 23781902.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2614838 + ... + 2614845.

It is an arithmetic number, because the mean of its divisors is an integer number (6101298).

Almost surely, 2^20918732 is an apocalyptic number.

It is an amenable number.

20918732 is a deficient number, since it is larger than the sum of its proper divisors (15689056).

20918732 is a wasteful number, since it uses less digits than its factorization.

20918732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5229687 (or 5229685 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20918732 is about 4573.7000338894. The cubic root of 20918732 is about 275.5360650983.

The spelling of 20918732 in words is "twenty million, nine hundred eighteen thousand, seven hundred thirty-two".