20430338977 has 2 divisors, whose sum is σ = 20430338978. Its totient is φ = 20430338976.

The previous prime is 20430338969. The next prime is 20430338993. The reversal of 20430338977 is 77983303402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18598413376 + 1831925601 = 136376^2 + 42801^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430338977 - 2³ = 20430338969 is a prime.

It is not a weakly prime, because it can be changed into another prime (20430338927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215169488 + 10215169489.

It is an arithmetic number, because the mean of its divisors is an integer number (10215169489).

Almost surely, 2^20430338977 is an apocalyptic number.

It is an amenable number.

20430338977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430338977 is an equidigital number, since it uses as much as digits as its factorization.

20430338977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 46.

The spelling of 20430338977 in words is "twenty billion, four hundred thirty million, three hundred thirty-eight thousand, nine hundred seventy-seven".