20679843731 has 2 divisors, whose sum is σ = 20679843732. Its totient is φ = 20679843730.

The previous prime is 20679843727. The next prime is 20679843761. The reversal of 20679843731 is 13734897602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20679843731 - 2² = 20679843727 is a prime.

It is a super-2 number, since 2×20679843731² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20679843731.

It is not a weakly prime, because it can be changed into another prime (20679843721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339921865 + 10339921866.

It is an arithmetic number, because the mean of its divisors is an integer number (10339921866).

Almost surely, 2^20679843731 is an apocalyptic number.

20679843731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20679843731 is an equidigital number, since it uses as much as digits as its factorization.

20679843731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 20679843731 in words is "twenty billion, six hundred seventy-nine million, eight hundred forty-three thousand, seven hundred thirty-one".