20977713 has 12 divisors (see below), whose sum is σ = 30345588. Its totient is φ = 13964640.

The previous prime is 20977709. The next prime is 20977753. The reversal of 20977713 is 31777902.

It can be written as a sum of positive squares in 2 ways, for example, as 11778624 + 9199089 = 3432^2 + 3033^2 .

It is not a de Polignac number, because 20977713 - 2² = 20977709 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20977703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7231 + ... + 9707.

It is an arithmetic number, because the mean of its divisors is an integer number (2528799).

Almost surely, 2^20977713 is an apocalyptic number.

It is an amenable number.

20977713 is a deficient number, since it is larger than the sum of its proper divisors (9367875).

20977713 is a wasteful number, since it uses less digits than its factorization.

20977713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3424 (or 3421 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 20977713 is about 4580.1433383684. The cubic root of 20977713 is about 275.7947828633.

The spelling of 20977713 in words is "twenty million, nine hundred seventy-seven thousand, seven hundred thirteen".