20305610977 has 2 divisors, whose sum is σ = 20305610978. Its totient is φ = 20305610976.

The previous prime is 20305610959. The next prime is 20305610987. The reversal of 20305610977 is 77901650302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14190527376 + 6115083601 = 119124^2 + 78199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20305610977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20305610947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152805488 + 10152805489.

It is an arithmetic number, because the mean of its divisors is an integer number (10152805489).

Almost surely, 2^20305610977 is an apocalyptic number.

It is an amenable number.

20305610977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305610977 is an equidigital number, since it uses as much as digits as its factorization.

20305610977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 40.

The spelling of 20305610977 in words is "twenty billion, three hundred five million, six hundred ten thousand, nine hundred seventy-seven".