20001332077 has 2 divisors, whose sum is σ = 20001332078. Its totient is φ = 20001332076.

The previous prime is 20001332063. The next prime is 20001332089. The reversal of 20001332077 is 77023310002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14074025956 + 5927306121 = 118634^2 + 76989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001332077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001332027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000666038 + 10000666039.

It is an arithmetic number, because the mean of its divisors is an integer number (10000666039).

Almost surely, 2^20001332077 is an apocalyptic number.

It is an amenable number.

20001332077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001332077 is an equidigital number, since it uses as much as digits as its factorization.

20001332077 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 25.

Adding to 20001332077 its reverse (77023310002), we get a palindrome (97024642079).

The spelling of 20001332077 in words is "twenty billion, one million, three hundred thirty-two thousand, seventy-seven".