20022780977 has 2 divisors, whose sum is σ = 20022780978. Its totient is φ = 20022780976.

The previous prime is 20022780949. The next prime is 20022780989. The reversal of 20022780977 is 77908722002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13509645361 + 6513135616 = 116231^2 + 80704^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022780977 - 2¹² = 20022776881 is a prime.

It is a super-3 number, since 3×20022780977³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20022780937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011390488 + 10011390489.

It is an arithmetic number, because the mean of its divisors is an integer number (10011390489).

Almost surely, 2^20022780977 is an apocalyptic number.

It is an amenable number.

20022780977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20022780977 is an equidigital number, since it uses as much as digits as its factorization.

20022780977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 44.

The spelling of 20022780977 in words is "twenty billion, twenty-two million, seven hundred eighty thousand, nine hundred seventy-seven".