20756648 has 16 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 9434800.

The previous prime is 20756633. The next prime is 20756699. The reversal of 20756648 is 84665702.

It is a happy number.

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, 117848 + ... + 118023.

It is an arithmetic number, because the mean of its divisors is an integer number (2653560).

Almost surely, 2^20756648 is an apocalyptic number.

It is an amenable number.

20756648 is an abundant number, since it is smaller than the sum of its proper divisors (21700312).

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

20756648 is a wasteful number, since it uses less digits than its factorization.

20756648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235888 (or 235884 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 20756648 is about 4555.9464439346. The cubic root of 20756648 is about 274.8225764642.

The spelling of 20756648 in words is "twenty million, seven hundred fifty-six thousand, six hundred forty-eight".