20994872 has 16 divisors (see below), whose sum is σ = 39463200. Its totient is φ = 10471360.

The previous prime is 20994863. The next prime is 20994887. The reversal of 20994872 is 27849902.

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, 404 + ... + 6492.

It is an arithmetic number, because the mean of its divisors is an integer number (2466450).

Almost surely, 2^20994872 is an apocalyptic number.

It is an amenable number.

20994872 is a deficient number, since it is larger than the sum of its proper divisors (18468328).

20994872 is a wasteful number, since it uses less digits than its factorization.

20994872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6526 (or 6522 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20994872 is about 4582.0161501243. The cubic root of 20994872 is about 275.8699590430.

The spelling of 20994872 in words is "twenty million, nine hundred ninety-four thousand, eight hundred seventy-two".