20320372731959 has 2 divisors, whose sum is σ = 20320372731960. Its totient is φ = 20320372731958.

The previous prime is 20320372731947. The next prime is 20320372731979. The reversal of 20320372731959 is 95913727302302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20320372731959 - 2⁴ = 20320372731943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20320372731959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320372731979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160186365979 + 10160186365980.

It is an arithmetic number, because the mean of its divisors is an integer number (10160186365980).

Almost surely, 2^{20320372731959} is an apocalyptic number.

20320372731959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320372731959 is an equidigital number, since it uses as much as digits as its factorization.

20320372731959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4286520, while the sum is 53.

The spelling of 20320372731959 in words is "twenty trillion, three hundred twenty billion, three hundred seventy-two million, seven hundred thirty-one thousand, nine hundred fifty-nine".