20509277077 has 32 divisors (see below), whose sum is σ = 22092871680. Its totient is φ = 18996120000.

The previous prime is 20509277057. The next prime is 20509277099. The reversal of 20509277077 is 77077290502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20509277077 - 2²³ = 20500888469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20509277057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27752374 + ... + 27753112.

It is an arithmetic number, because the mean of its divisors is an integer number (690402240).

Almost surely, 2^20509277077 is an apocalyptic number.

It is an amenable number.

20509277077 is a deficient number, since it is larger than the sum of its proper divisors (1583594603).

20509277077 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (20509277076) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1105).

20509277077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105.

The product of its (nonzero) digits is 432180, while the sum is 46.

The spelling of 20509277077 in words is "twenty billion, five hundred nine million, two hundred seventy-seven thousand, seventy-seven".