20869990 has 16 divisors (see below), whose sum is σ = 37793952. Its totient is φ = 8297344.

The previous prime is 20869987. The next prime is 20870023. The reversal of 20869990 is 9996802.

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, 4579 + ... + 7918.

It is an arithmetic number, because the mean of its divisors is an integer number (2362122).

Almost surely, 2^20869990 is an apocalyptic number.

20869990 is a deficient number, since it is larger than the sum of its proper divisors (16923962).

20869990 is a wasteful number, since it uses less digits than its factorization.

20869990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12671.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 20869990 is about 4568.3684177176. The cubic root of 20869990 is about 275.3218930431.

The spelling of 20869990 in words is "twenty million, eight hundred sixty-nine thousand, nine hundred ninety".