20313289 has 4 divisors (see below), whose sum is σ = 20322324. Its totient is φ = 20304256.

The previous prime is 20313281. The next prime is 20313343. The reversal of 20313289 is 98231302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9815689 + 10497600 = 3133^2 + 3240^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313289 - 2³ = 20313281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20313281) 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, 1809 + ... + 6625.

It is an arithmetic number, because the mean of its divisors is an integer number (5080581).

Almost surely, 2^20313289 is an apocalyptic number.

It is an amenable number.

20313289 is a deficient number, since it is larger than the sum of its proper divisors (9035).

20313289 is an equidigital number, since it uses as much as digits as its factorization.

20313289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9034.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20313289 is about 4507.0266251710. The cubic root of 20313289 is about 272.8517534743.

It can be divided in two parts, 20313 and 289, that added together give a palindrome (20602).

The spelling of 20313289 in words is "twenty million, three hundred thirteen thousand, two hundred eighty-nine".