20312699 has 4 divisors (see below), whose sum is σ = 22159320. Its totient is φ = 18466080.

The previous prime is 20312693. The next prime is 20312713. The reversal of 20312699 is 99621302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20312699 - 2⁴ = 20312683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312693) 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, 923294 + ... + 923315.

It is an arithmetic number, because the mean of its divisors is an integer number (5539830).

Almost surely, 2^20312699 is an apocalyptic number.

20312699 is a deficient number, since it is larger than the sum of its proper divisors (1846621).

20312699 is a wasteful number, since it uses less digits than its factorization.

20312699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846620.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 20312699 is about 4506.9611713437. The cubic root of 20312699 is about 272.8491117867.

The spelling of 20312699 in words is "twenty million, three hundred twelve thousand, six hundred ninety-nine".