20000108977 has 2 divisors, whose sum is σ = 20000108978. Its totient is φ = 20000108976.

The previous prime is 20000108969. The next prime is 20000108993. The reversal of 20000108977 is 77980100002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14689197601 + 5310911376 = 121199^2 + 72876^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000108977 - 2³ = 20000108969 is a prime.

It is not a weakly prime, because it can be changed into another prime (20000108917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000054488 + 10000054489.

It is an arithmetic number, because the mean of its divisors is an integer number (10000054489).

Almost surely, 2^20000108977 is an apocalyptic number.

It is an amenable number.

20000108977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000108977 is an equidigital number, since it uses as much as digits as its factorization.

20000108977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

Adding to 20000108977 its reverse (77980100002), we get a palindrome (97980208979).

The spelling of 20000108977 in words is "twenty billion, one hundred eight thousand, nine hundred seventy-seven".