20209872 has 40 divisors (see below), whose sum is σ = 55282176. Its totient is φ = 6340096.

The previous prime is 20209841. The next prime is 20209883. The reversal of 20209872 is 27890202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11568 + ... + 13199.

Almost surely, 2^20209872 is an apocalyptic number.

It is an amenable number.

20209872 is an abundant number, since it is smaller than the sum of its proper divisors (35072304).

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

20209872 is a wasteful number, since it uses less digits than its factorization.

20209872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24795 (or 24789 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20209872 is about 4495.5391222856. The cubic root of 20209872 is about 272.3879268672.

The spelling of 20209872 in words is "twenty million, two hundred nine thousand, eight hundred seventy-two".