20328570 has 40 divisors (see below), whose sum is σ = 54663444. Its totient is φ = 5420736.

The previous prime is 20328569. The next prime is 20328589. The reversal of 20328570 is 7582302.

It can be written as a sum of positive squares in 2 ways, for example, as 19686969 + 641601 = 4437^2 + 801^2 .

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 19 ways as a sum of consecutive naturals, for example, 11739 + ... + 13358.

Almost surely, 2^20328570 is an apocalyptic number.

20328570 is an abundant number, since it is smaller than the sum of its proper divisors (34334874).

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

20328570 is a wasteful number, since it uses less digits than its factorization.

20328570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25116 (or 25107 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20328570 is about 4508.7215482884. The cubic root of 20328570 is about 272.9201553724.

The spelling of 20328570 in words is "twenty million, three hundred twenty-eight thousand, five hundred seventy".