20977508 has 12 divisors (see below), whose sum is σ = 36865920. Its totient is φ = 10444392.

The previous prime is 20977477. The next prime is 20977519. The reversal of 20977508 is 80577902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10016 + ... + 11927.

It is an arithmetic number, because the mean of its divisors is an integer number (3072160).

Almost surely, 2^20977508 is an apocalyptic number.

It is an amenable number.

20977508 is a deficient number, since it is larger than the sum of its proper divisors (15888412).

20977508 is a wasteful number, since it uses less digits than its factorization.

20977508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22186 (or 22184 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 20977508 is about 4580.1209591014. The cubic root of 20977508 is about 275.7938844795.

The spelling of 20977508 in words is "twenty million, nine hundred seventy-seven thousand, five hundred eight".