20801299913 has 2 divisors, whose sum is σ = 20801299914. Its totient is φ = 20801299912.

The previous prime is 20801299879. The next prime is 20801299933. The reversal of 20801299913 is 31999210802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19690544329 + 1110755584 = 140323^2 + 33328^2 .

It is a cyclic number.

It is not a de Polignac number, because 20801299913 - 2²⁰ = 20800251337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20801299933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10400649956 + 10400649957.

It is an arithmetic number, because the mean of its divisors is an integer number (10400649957).

Almost surely, 2^20801299913 is an apocalyptic number.

It is an amenable number.

20801299913 is a deficient number, since it is larger than the sum of its proper divisors (1).

20801299913 is an equidigital number, since it uses as much as digits as its factorization.

20801299913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 20801299913 in words is "twenty billion, eight hundred one million, two hundred ninety-nine thousand, nine hundred thirteen".