20312999 has 12 divisors (see below), whose sum is σ = 24208128. Its totient is φ = 16984800.

The previous prime is 20312989. The next prime is 20313001. The reversal of 20312999 is 99921302.

It is not a de Polignac number, because 20312999 - 2⁴ = 20312983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312959) 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, 3047 + ... + 7064.

It is an arithmetic number, because the mean of its divisors is an integer number (2017344).

Almost surely, 2^20312999 is an apocalyptic number.

20312999 is a deficient number, since it is larger than the sum of its proper divisors (3895129).

20312999 is a wasteful number, since it uses less digits than its factorization.

20312999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10166 (or 10159 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 20312999 is about 4506.9944530696. The cubic root of 20312999 is about 272.8504550241.

The spelling of 20312999 in words is "twenty million, three hundred twelve thousand, nine hundred ninety-nine".