20620642577 has 2 divisors, whose sum is σ = 20620642578. Its totient is φ = 20620642576.

The previous prime is 20620642573. The next prime is 20620642607. The reversal of 20620642577 is 77524602602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19727887936 + 892754641 = 140456^2 + 29879^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620642577 - 2² = 20620642573 is a prime.

It is not a weakly prime, because it can be changed into another prime (20620642573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310321288 + 10310321289.

It is an arithmetic number, because the mean of its divisors is an integer number (10310321289).

Almost surely, 2^20620642577 is an apocalyptic number.

It is an amenable number.

20620642577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620642577 is an equidigital number, since it uses as much as digits as its factorization.

20620642577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 41.

The spelling of 20620642577 in words is "twenty billion, six hundred twenty million, six hundred forty-two thousand, five hundred seventy-seven".