20879724 has 12 divisors (see below), whose sum is σ = 48719384. Its totient is φ = 6959904.

The previous prime is 20879717. The next prime is 20879741. The reversal of 20879724 is 42797802.

It is a tau number, because it is divible by the number of its divisors (12).

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, 869977 + ... + 870000.

Almost surely, 2^20879724 is an apocalyptic number.

It is an amenable number.

20879724 is an abundant number, since it is smaller than the sum of its proper divisors (27839660).

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

20879724 is a wasteful number, since it uses less digits than its factorization.

20879724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739984 (or 1739982 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 20879724 is about 4569.4336629390. The cubic root of 20879724 is about 275.3646908077.

It can be divided in two parts, 2087 and 9724, that added together give a palindrome (11811).

The spelling of 20879724 in words is "twenty million, eight hundred seventy-nine thousand, seven hundred twenty-four".