20001120977 has 2 divisors, whose sum is σ = 20001120978. Its totient is φ = 20001120976.

The previous prime is 20001120967. The next prime is 20001121031. The reversal of 20001120977 is 77902110002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15807781441 + 4193339536 = 125729^2 + 64756^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001120977 - 2⁴ = 20001120961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001120967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000560488 + 10000560489.

It is an arithmetic number, because the mean of its divisors is an integer number (10000560489).

Almost surely, 2^20001120977 is an apocalyptic number.

It is an amenable number.

20001120977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001120977 is an equidigital number, since it uses as much as digits as its factorization.

20001120977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 29.

Adding to 20001120977 its reverse (77902110002), we get a palindrome (97903230979).

The spelling of 20001120977 in words is "twenty billion, one million, one hundred twenty thousand, nine hundred seventy-seven".