20977308 has 36 divisors (see below), whose sum is σ = 57847608. Its totient is φ = 6356640.

The previous prime is 20977301. The next prime is 20977321. The reversal of 20977308 is 80377902.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26091 + ... + 26882.

It is an arithmetic number, because the mean of its divisors is an integer number (1606878).

Almost surely, 2^20977308 is an apocalyptic number.

It is an amenable number.

20977308 is an abundant number, since it is smaller than the sum of its proper divisors (36870300).

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

20977308 is a wasteful number, since it uses less digits than its factorization.

20977308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52994 (or 52989 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20977308 is about 4580.0991255649. The cubic root of 20977308 is about 275.7930080018.

The spelling of 20977308 in words is "twenty million, nine hundred seventy-seven thousand, three hundred eight".