20867990 has 32 divisors (see below), whose sum is σ = 44132256. Its totient is φ = 7004160.

The previous prime is 20867989. The next prime is 20868007. The reversal of 20867990 is 9976802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5867 + ... + 8726.

It is an arithmetic number, because the mean of its divisors is an integer number (1379133).

Almost surely, 2^20867990 is an apocalyptic number.

20867990 is an abundant number, since it is smaller than the sum of its proper divisors (23264266).

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

20867990 is a wasteful number, since it uses less digits than its factorization.

20867990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14624.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20867990 is about 4568.1495159419. The cubic root of 20867990 is about 275.3130979363.

The spelling of 20867990 in words is "twenty million, eight hundred sixty-seven thousand, nine hundred ninety".