20929986 has 48 divisors (see below), whose sum is σ = 56541888. Its totient is φ = 5436000.

The previous prime is 20929969. The next prime is 20930011. The reversal of 20929986 is 68992902.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6165 + ... + 8936.

It is an arithmetic number, because the mean of its divisors is an integer number (1177956).

Almost surely, 2^20929986 is an apocalyptic number.

20929986 is an abundant number, since it is smaller than the sum of its proper divisors (35611902).

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

20929986 is a wasteful number, since it uses less digits than its factorization.

20929986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15127 (or 15124 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 20929986 is about 4574.9301634014. The cubic root of 20929986 is about 275.5854678213.

The spelling of 20929986 in words is "twenty million, nine hundred twenty-nine thousand, nine hundred eighty-six".