20977900 has 72 divisors (see below), whose sum is σ = 48972560. Its totient is φ = 7776000.

The previous prime is 20977889. The next prime is 20977951. The reversal of 20977900 is 977902.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 115810 + ... + 115990.

Almost surely, 2^20977900 is an apocalyptic number.

20977900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20977900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24486280).

20977900 is an abundant number, since it is smaller than the sum of its proper divisors (27994660).

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

20977900 is a wasteful number, since it uses less digits than its factorization.

20977900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 20977900 is about 4580.1637525311. The cubic root of 20977900 is about 275.7956023596.

The spelling of 20977900 in words is "twenty million, nine hundred seventy-seven thousand, nine hundred".