20872490 has 16 divisors (see below), whose sum is σ = 37923552. Its totient is φ = 8270544.

The previous prime is 20872487. The next prime is 20872499. The reversal of 20872490 is 9427802.

It is not an unprimeable number, because it can be changed into a prime (20872499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8684 + ... + 10823.

It is an arithmetic number, because the mean of its divisors is an integer number (2370222).

Almost surely, 2^20872490 is an apocalyptic number.

20872490 is a deficient number, since it is larger than the sum of its proper divisors (17051062).

20872490 is a wasteful number, since it uses less digits than its factorization.

20872490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19621.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20872490 is about 4568.6420301880. The cubic root of 20872490 is about 275.3328861366.

The spelling of 20872490 in words is "twenty million, eight hundred seventy-two thousand, four hundred ninety".