20120686931 has 2 divisors, whose sum is σ = 20120686932. Its totient is φ = 20120686930.

The previous prime is 20120686903. The next prime is 20120686933. The reversal of 20120686931 is 13968602102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20120686931 - 2¹⁸ = 20120424787 is a prime.

It is a super-2 number, since 2×20120686931² (a number of 21 digits) contains 22 as substring.

Together with 20120686933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20120686933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060343465 + 10060343466.

It is an arithmetic number, because the mean of its divisors is an integer number (10060343466).

Almost surely, 2^20120686931 is an apocalyptic number.

20120686931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120686931 is an equidigital number, since it uses as much as digits as its factorization.

20120686931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 20120686931 in words is "twenty billion, one hundred twenty million, six hundred eighty-six thousand, nine hundred thirty-one".