20977752 has 32 divisors (see below), whose sum is σ = 53081280. Its totient is φ = 6907680.

The previous prime is 20977709. The next prime is 20977753. The reversal of 20977752 is 25777902.

It is a self number, because there is not a number n which added to its sum of digits gives 20977752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977753) 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 7 ways as a sum of consecutive naturals, for example, 3274 + ... + 7257.

It is an arithmetic number, because the mean of its divisors is an integer number (1658790).

Almost surely, 2^20977752 is an apocalyptic number.

It is an amenable number.

20977752 is an abundant number, since it is smaller than the sum of its proper divisors (32103528).

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

20977752 is a wasteful number, since it uses less digits than its factorization.

20977752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10623 (or 10619 counting only the distinct ones).

The product of its (nonzero) digits is 61740, while the sum is 39.

The square root of 20977752 is about 4580.1475958750. The cubic root of 20977752 is about 275.7949537747.

The spelling of 20977752 in words is "twenty million, nine hundred seventy-seven thousand, seven hundred fifty-two".