20959724 has 6 divisors (see below), whose sum is σ = 36679524. Its totient is φ = 10479860.

The previous prime is 20959711. The next prime is 20959777. The reversal of 20959724 is 42795902.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2619962 + ... + 2619969.

It is an arithmetic number, because the mean of its divisors is an integer number (6113254).

Almost surely, 2^20959724 is an apocalyptic number.

It is an amenable number.

20959724 is a deficient number, since it is larger than the sum of its proper divisors (15719800).

20959724 is a wasteful number, since it uses less digits than its factorization.

20959724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5239935 (or 5239933 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 20959724 is about 4578.1791140147. The cubic root of 20959724 is about 275.7159262983.

The spelling of 20959724 in words is "twenty million, nine hundred fifty-nine thousand, seven hundred twenty-four".