20313431 has 4 divisors (see below), whose sum is σ = 20324472. Its totient is φ = 20302392.

The previous prime is 20313421. The next prime is 20313437. The reversal of 20313431 is 13431302.

It is a happy number.

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 is a cyclic number.

It is not a de Polignac number, because 20313431 - 2¹⁰ = 20312407 is a prime.

It is a super-2 number, since 2×20313431² = 825270957983522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313437) 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, 2021 + ... + 6686.

It is an arithmetic number, because the mean of its divisors is an integer number (5081118).

Almost surely, 2^20313431 is an apocalyptic number.

20313431 is a deficient number, since it is larger than the sum of its proper divisors (11041).

20313431 is an equidigital number, since it uses as much as digits as its factorization.

20313431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11040.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 20313431 is about 4507.0423783231. The cubic root of 20313431 is about 272.8523892627.

Adding to 20313431 its reverse (13431302), we get a palindrome (33744733).

The spelling of 20313431 in words is "twenty million, three hundred thirteen thousand, four hundred thirty-one".