20311130731 has 2 divisors, whose sum is σ = 20311130732. Its totient is φ = 20311130730.

The previous prime is 20311130729. The next prime is 20311130737. The reversal of 20311130731 is 13703111302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20311130731 - 2¹ = 20311130729 is a prime.

It is a super-2 number, since 2×20311130731² (a number of 21 digits) contains 22 as substring.

Together with 20311130729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20311130737) 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, 10155565365 + 10155565366.

It is an arithmetic number, because the mean of its divisors is an integer number (10155565366).

Almost surely, 2^20311130731 is an apocalyptic number.

20311130731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311130731 is an equidigital number, since it uses as much as digits as its factorization.

20311130731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 22.

The spelling of 20311130731 in words is "twenty billion, three hundred eleven million, one hundred thirty thousand, seven hundred thirty-one".