20442042977 has 2 divisors, whose sum is σ = 20442042978. Its totient is φ = 20442042976.

The previous prime is 20442042949. The next prime is 20442042991. The reversal of 20442042977 is 77924024402.

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., 19434869281 + 1007173696 = 139409^2 + 31736^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442042977 - 2⁸ = 20442042721 is a prime.

It is not a weakly prime, because it can be changed into another prime (20442042917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221021488 + 10221021489.

It is an arithmetic number, because the mean of its divisors is an integer number (10221021489).

Almost surely, 2^20442042977 is an apocalyptic number.

It is an amenable number.

20442042977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442042977 is an equidigital number, since it uses as much as digits as its factorization.

20442042977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 20442042977 in words is "twenty billion, four hundred forty-two million, forty-two thousand, nine hundred seventy-seven".