20202120977 has 2 divisors, whose sum is σ = 20202120978. Its totient is φ = 20202120976.

The previous prime is 20202120941. The next prime is 20202121007. The reversal of 20202120977 is 77902120202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18160527121 + 2041593856 = 134761^2 + 45184^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202120977 - 2⁸ = 20202120721 is a prime.

It is not a weakly prime, because it can be changed into another prime (20202128977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101060488 + 10101060489.

It is an arithmetic number, because the mean of its divisors is an integer number (10101060489).

Almost surely, 2^20202120977 is an apocalyptic number.

It is an amenable number.

20202120977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202120977 is an equidigital number, since it uses as much as digits as its factorization.

20202120977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The spelling of 20202120977 in words is "twenty billion, two hundred two million, one hundred twenty thousand, nine hundred seventy-seven".