20564992 has 88 divisors (see below), whose sum is σ = 49783040. Its totient is φ = 8294400.

The previous prime is 20564989. The next prime is 20565001. The reversal of 20564992 is 29946502.

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, 136117 + ... + 136267.

Almost surely, 2^20564992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20564992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24891520).

20564992 is an abundant number, since it is smaller than the sum of its proper divisors (29218048).

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

20564992 is a wasteful number, since it uses less digits than its factorization.

20564992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 20564992 is about 4534.8640552943. The cubic root of 20564992 is about 273.9741037916.

The spelling of 20564992 in words is "twenty million, five hundred sixty-four thousand, nine hundred ninety-two".