20328577 has 4 divisors (see below), whose sum is σ = 20878036. Its totient is φ = 19779120.

The previous prime is 20328569. The next prime is 20328589. The reversal of 20328577 is 77582302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9511056 + 10817521 = 3084^2 + 3289^2 .

It is a cyclic number.

It is not a de Polignac number, because 20328577 - 2³ = 20328569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20328547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274674 + ... + 274747.

It is an arithmetic number, because the mean of its divisors is an integer number (5219509).

Almost surely, 2^20328577 is an apocalyptic number.

It is an amenable number.

20328577 is a deficient number, since it is larger than the sum of its proper divisors (549459).

20328577 is an equidigital number, since it uses as much as digits as its factorization.

20328577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549458.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 20328577 is about 4508.7223245616. The cubic root of 20328577 is about 272.9201866984.

It can be divided in two parts, 2032 and 8577, that added together give a square (10609 = 103²).

The spelling of 20328577 in words is "twenty million, three hundred twenty-eight thousand, five hundred seventy-seven".