20323289 has 12 divisors (see below), whose sum is σ = 23753268. Its totient is φ = 17337600.

The previous prime is 20323271. The next prime is 20323291. The reversal of 20323289 is 98232302.

It can be written as a sum of positive squares in 2 ways, for example, as 15147664 + 5175625 = 3892^2 + 2275^2 .

It is not a de Polignac number, because 20323289 - 2¹⁶ = 20257753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20323489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10949 + ... + 12669.

It is an arithmetic number, because the mean of its divisors is an integer number (1979439).

Almost surely, 2^20323289 is an apocalyptic number.

It is an amenable number.

20323289 is a deficient number, since it is larger than the sum of its proper divisors (3429979).

20323289 is a wasteful number, since it uses less digits than its factorization.

20323289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976 (or 1969 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20323289 is about 4508.1358675177. The cubic root of 20323289 is about 272.8965200623.

The spelling of 20323289 in words is "twenty million, three hundred twenty-three thousand, two hundred eighty-nine".