20921796 has 36 divisors (see below), whose sum is σ = 60441472. Its totient is φ = 5977584.

The previous prime is 20921777. The next prime is 20921801. The reversal of 20921796 is 69712902.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20921796.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41260 + ... + 41763.

Almost surely, 2^20921796 is an apocalyptic number.

It is an amenable number.

20921796 is an abundant number, since it is smaller than the sum of its proper divisors (39519676).

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

20921796 is a wasteful number, since it uses less digits than its factorization.

20921796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83040 (or 83035 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 20921796 is about 4574.0349801898. The cubic root of 20921796 is about 275.5495171770.

The spelling of 20921796 in words is "twenty million, nine hundred twenty-one thousand, seven hundred ninety-six".