20577262091 has 2 divisors, whose sum is σ = 20577262092. Its totient is φ = 20577262090.

The previous prime is 20577262063. The next prime is 20577262099. The reversal of 20577262091 is 19026277502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20577262091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20577262099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288631045 + 10288631046.

It is an arithmetic number, because the mean of its divisors is an integer number (10288631046).

Almost surely, 2^20577262091 is an apocalyptic number.

20577262091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20577262091 is an equidigital number, since it uses as much as digits as its factorization.

20577262091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 20577262091 in words is "twenty billion, five hundred seventy-seven million, two hundred sixty-two thousand, ninety-one".