20312802973 has 2 divisors, whose sum is σ = 20312802974. Its totient is φ = 20312802972.

The previous prime is 20312802907. The next prime is 20312802989. The reversal of 20312802973 is 37920821302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19522237284 + 790565689 = 139722^2 + 28117^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312802973 - 2²⁹ = 19775932061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312802073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156401486 + 10156401487.

It is an arithmetic number, because the mean of its divisors is an integer number (10156401487).

Almost surely, 2^20312802973 is an apocalyptic number.

It is an amenable number.

20312802973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312802973 is an equidigital number, since it uses as much as digits as its factorization.

20312802973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 20312802973 in words is "twenty billion, three hundred twelve million, eight hundred two thousand, nine hundred seventy-three".