20928764 has 12 divisors (see below), whose sum is σ = 36666504. Its totient is φ = 10452624.

The previous prime is 20928757. The next prime is 20928769. The reversal of 20928764 is 46782902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20928769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1979 + ... + 6765.

It is an arithmetic number, because the mean of its divisors is an integer number (3055542).

Almost surely, 2^20928764 is an apocalyptic number.

It is an amenable number.

20928764 is a deficient number, since it is larger than the sum of its proper divisors (15737740).

20928764 is a wasteful number, since it uses less digits than its factorization.

20928764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5884 (or 5882 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 20928764 is about 4574.7966075007. The cubic root of 20928764 is about 275.5801043522.

The spelling of 20928764 in words is "twenty million, nine hundred twenty-eight thousand, seven hundred sixty-four".