20312997 has 8 divisors (see below), whose sum is σ = 27185760. Its totient is φ = 13491120.

The previous prime is 20312989. The next prime is 20313001. The reversal of 20312997 is 79921302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20312997 - 2³ = 20312989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11779 + ... + 13392.

It is an arithmetic number, because the mean of its divisors is an integer number (3398220).

Almost surely, 2^20312997 is an apocalyptic number.

It is an amenable number.

20312997 is a deficient number, since it is larger than the sum of its proper divisors (6872763).

20312997 is a wasteful number, since it uses less digits than its factorization.

20312997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25443.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 20312997 is about 4506.9942311922. The cubic root of 20312997 is about 272.8504460692.

The spelling of 20312997 in words is "twenty million, three hundred twelve thousand, nine hundred ninety-seven".