20332319977 has 2 divisors, whose sum is σ = 20332319978. Its totient is φ = 20332319976.

The previous prime is 20332319941. The next prime is 20332320017. The reversal of 20332319977 is 77991323302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14222709081 + 6109610896 = 119259^2 + 78164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20332319977 is a prime.

It is a super-2 number, since 2×20332319977² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20332319177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10166159988 + 10166159989.

It is an arithmetic number, because the mean of its divisors is an integer number (10166159989).

Almost surely, 2^20332319977 is an apocalyptic number.

It is an amenable number.

20332319977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20332319977 is an equidigital number, since it uses as much as digits as its factorization.

20332319977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 428652, while the sum is 46.

The spelling of 20332319977 in words is "twenty billion, three hundred thirty-two million, three hundred nineteen thousand, nine hundred seventy-seven".