20742872 has 32 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 9788064.

The previous prime is 20742857. The next prime is 20742881. The reversal of 20742872 is 27824702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13823 + ... + 15249.

It is an arithmetic number, because the mean of its divisors is an integer number (1285200).

Almost surely, 2^20742872 is an apocalyptic number.

It is an amenable number.

20742872 is a deficient number, since it is larger than the sum of its proper divisors (20383528).

20742872 is a wasteful number, since it uses less digits than its factorization.

20742872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535 (or 1531 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 20742872 is about 4554.4343227233. The cubic root of 20742872 is about 274.7617639205.

The spelling of 20742872 in words is "twenty million, seven hundred forty-two thousand, eight hundred seventy-two".