20977504 has 12 divisors (see below), whose sum is σ = 41299524. Its totient is φ = 10488736.

The previous prime is 20977477. The next prime is 20977519. The reversal of 20977504 is 40577902.

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 a self number, because there is not a number n which added to its sum of digits gives 20977504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327742 + ... + 327805.

It is an arithmetic number, because the mean of its divisors is an integer number (3441627).

Almost surely, 2^20977504 is an apocalyptic number.

It is an amenable number.

20977504 is a deficient number, since it is larger than the sum of its proper divisors (20322020).

20977504 is an equidigital number, since it uses as much as digits as its factorization.

20977504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655557 (or 655549 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20977504 is about 4580.1205224317. The cubic root of 20977504 is about 275.7938669500.

The spelling of 20977504 in words is "twenty million, nine hundred seventy-seven thousand, five hundred four".