20312086939 has 4 divisors (see below), whose sum is σ = 21012503760. Its totient is φ = 19611670120.

The previous prime is 20312086831. The next prime is 20312086943. The reversal of 20312086939 is 93968021302.

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 20312086939 - 2³¹ = 18164603291 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20312086895 and 20312086904.

It is not an unprimeable number, because it can be changed into a prime (20312086979) 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, 350208367 + ... + 350208424.

It is an arithmetic number, because the mean of its divisors is an integer number (5253125940).

Almost surely, 2^20312086939 is an apocalyptic number.

20312086939 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20312086939 is a deficient number, since it is larger than the sum of its proper divisors (700416821).

20312086939 is an equidigital number, since it uses as much as digits as its factorization.

20312086939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700416820.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 20312086939 in words is "twenty billion, three hundred twelve million, eighty-six thousand, nine hundred thirty-nine".