20513242023973 has 2 divisors, whose sum is σ = 20513242023974. Its totient is φ = 20513242023972.

The previous prime is 20513242023971. The next prime is 20513242024003. The reversal of 20513242023973 is 37932024231502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19697068907044 + 816173116929 = 4438138^2 + 903423^2 .

It is a cyclic number.

It is not a de Polignac number, because 20513242023973 - 2¹ = 20513242023971 is a prime.

Together with 20513242023971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20513242023971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256621011986 + 10256621011987.

It is an arithmetic number, because the mean of its divisors is an integer number (10256621011987).

Almost surely, 2^{20513242023973} is an apocalyptic number.

It is an amenable number.

20513242023973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20513242023973 is an equidigital number, since it uses as much as digits as its factorization.

20513242023973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 43.

The spelling of 20513242023973 in words is "twenty trillion, five hundred thirteen billion, two hundred forty-two million, twenty-three thousand, nine hundred seventy-three".