20312739 has 12 divisors (see below), whose sum is σ = 31066776. Its totient is φ = 12745152.

The previous prime is 20312713. The next prime is 20312779. The reversal of 20312739 is 93721302.

It is not a de Polignac number, because 20312739 - 2⁸ = 20312483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20312779) 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, 66229 + ... + 66534.

It is an arithmetic number, because the mean of its divisors is an integer number (2588898).

Almost surely, 2^20312739 is an apocalyptic number.

20312739 is a deficient number, since it is larger than the sum of its proper divisors (10754037).

20312739 is a wasteful number, since it uses less digits than its factorization.

20312739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132786 (or 132783 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20312739 is about 4506.9656089214. The cubic root of 20312739 is about 272.8492908858.

The spelling of 20312739 in words is "twenty million, three hundred twelve thousand, seven hundred thirty-nine".