20326689 has 6 divisors (see below), whose sum is σ = 29360786. Its totient is φ = 13551120.

The previous prime is 20326681. The next prime is 20326699. The reversal of 20326689 is 98662302.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 613089 = 4440^2 + 783^2 .

It is not a de Polignac number, because 20326689 - 2³ = 20326681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20326681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1129252 + ... + 1129269.

Almost surely, 2^20326689 is an apocalyptic number.

It is an amenable number.

20326689 is a deficient number, since it is larger than the sum of its proper divisors (9034097).

20326689 is a wasteful number, since it uses less digits than its factorization.

20326689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258527 (or 2258524 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 20326689 is about 4508.5129477467. The cubic root of 20326689 is about 272.9117373570.

The spelling of 20326689 in words is "twenty million, three hundred twenty-six thousand, six hundred eighty-nine".