20445804 has 48 divisors (see below), whose sum is σ = 55319040. Its totient is φ = 6518160.

The previous prime is 20445791. The next prime is 20445823. The reversal of 20445804 is 40854402.

20445804 is a `hidden beast` number, since 204 + 458 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1632 + ... + 6599.

It is an arithmetic number, because the mean of its divisors is an integer number (1152480).

Almost surely, 2^20445804 is an apocalyptic number.

It is an amenable number.

20445804 is an abundant number, since it is smaller than the sum of its proper divisors (34873236).

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

20445804 is a wasteful number, since it uses less digits than its factorization.

20445804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8267 (or 8259 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 20445804 is about 4521.7036612321. The cubic root of 20445804 is about 273.4437897155.

The spelling of 20445804 in words is "twenty million, four hundred forty-five thousand, eight hundred four".