20877683857 has 16 divisors (see below), whose sum is σ = 21871584000. Its totient is φ = 19903665600.

The previous prime is 20877683819. The next prime is 20877683881. The reversal of 20877683857 is 75838677802.

It is a cyclic number.

It is not a de Polignac number, because 20877683857 - 2¹¹ = 20877681809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20877683795 and 20877683804.

It is not an unprimeable number, because it can be changed into a prime (20877684857) 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, 717019 + ... + 745567.

It is an arithmetic number, because the mean of its divisors is an integer number (1366974000).

Almost surely, 2^20877683857 is an apocalyptic number.

It is an amenable number.

20877683857 is a deficient number, since it is larger than the sum of its proper divisors (993900143).

20877683857 is a wasteful number, since it uses less digits than its factorization.

20877683857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28896.

The product of its (nonzero) digits is 31610880, while the sum is 61.

The spelling of 20877683857 in words is "twenty billion, eight hundred seventy-seven million, six hundred eighty-three thousand, eight hundred fifty-seven".