20802875620049 has 2 divisors, whose sum is σ = 20802875620050. Its totient is φ = 20802875620048.

The previous prime is 20802875619979. The next prime is 20802875620057. The reversal of 20802875620049 is 94002657820802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11296105897024 + 9506769723025 = 3360968^2 + 3083305^2 .

It is a cyclic number.

It is not a de Polignac number, because 20802875620049 - 2⁸ = 20802875619793 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 (20802875620949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10401437810024 + 10401437810025.

It is an arithmetic number, because the mean of its divisors is an integer number (10401437810025).

Almost surely, 2^{20802875620049} is an apocalyptic number.

It is an amenable number.

20802875620049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20802875620049 is an equidigital number, since it uses as much as digits as its factorization.

20802875620049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 20802875620049 in words is "twenty trillion, eight hundred two billion, eight hundred seventy-five million, six hundred twenty thousand, forty-nine".