21806796 has 24 divisors (see below), whose sum is σ = 55508544. Its totient is φ = 6608080.

The previous prime is 21806749. The next prime is 21806803. The reversal of 21806796 is 69760812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82470 + ... + 82733.

It is an arithmetic number, because the mean of its divisors is an integer number (2312856).

Almost surely, 2^21806796 is an apocalyptic number.

It is an amenable number.

21806796 is an abundant number, since it is smaller than the sum of its proper divisors (33701748).

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

21806796 is a wasteful number, since it uses less digits than its factorization.

21806796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165221 (or 165219 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 21806796 is about 4669.7747269006. The cubic root of 21806796 is about 279.3812698221.

The spelling of 21806796 in words is "twenty-one million, eight hundred six thousand, seven hundred ninety-six".