20364861777 has 32 divisors (see below), whose sum is σ = 30533086080. Its totient is φ = 11986920960.

The previous prime is 20364861767. The next prime is 20364861793. The reversal of 20364861777 is 77716846302.

It is a happy number.

It is not a de Polignac number, because 20364861777 - 2¹⁴ = 20364845393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20364861767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36877 + ... + 205157.

It is an arithmetic number, because the mean of its divisors is an integer number (954158940).

Almost surely, 2^20364861777 is an apocalyptic number.

It is an amenable number.

20364861777 is a deficient number, since it is larger than the sum of its proper divisors (10168224303).

20364861777 is a wasteful number, since it uses less digits than its factorization.

20364861777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168433.

The product of its (nonzero) digits is 2370816, while the sum is 51.

The spelling of 20364861777 in words is "twenty billion, three hundred sixty-four million, eight hundred sixty-one thousand, seven hundred seventy-seven".