20977964 has 24 divisors (see below), whose sum is σ = 43092000. Its totient is φ = 8747136.

The previous prime is 20977951. The next prime is 20977967. The reversal of 20977964 is 46977902.

It is not an unprimeable number, because it can be changed into a prime (20977967) 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, 9089 + ... + 11160.

It is an arithmetic number, because the mean of its divisors is an integer number (1795500).

Almost surely, 2^20977964 is an apocalyptic number.

It is an amenable number.

20977964 is an abundant number, since it is smaller than the sum of its proper divisors (22114036).

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

20977964 is a wasteful number, since it uses less digits than its factorization.

20977964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20297 (or 20295 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 20977964 is about 4580.1707391756. The cubic root of 20977964 is about 275.7958828278.

The spelling of 20977964 in words is "twenty million, nine hundred seventy-seven thousand, nine hundred sixty-four".