20677054777 has 16 divisors (see below), whose sum is σ = 22252589568. Its totient is φ = 19175869440.

The previous prime is 20677054757. The next prime is 20677054787. The reversal of 20677054777 is 77745077602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20677054777 - 2³¹ = 18529571129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20677054747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75688 + ... + 216985.

It is an arithmetic number, because the mean of its divisors is an integer number (1390786848).

Almost surely, 2^20677054777 is an apocalyptic number.

It is an amenable number.

20677054777 is a deficient number, since it is larger than the sum of its proper divisors (1575534791).

20677054777 is a wasteful number, since it uses less digits than its factorization.

20677054777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292800.

The product of its (nonzero) digits is 4033680, while the sum is 52.

The spelling of 20677054777 in words is "twenty billion, six hundred seventy-seven million, fifty-four thousand, seven hundred seventy-seven".