20566990877 has 8 divisors (see below), whose sum is σ = 20722106496. Its totient is φ = 20411947872.

The previous prime is 20566990853. The next prime is 20566990891. The reversal of 20566990877 is 77809966502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20566990877 - 2⁸ = 20566990621 is a prime.

It is a super-2 number, since 2×20566990877² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566990177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639578 + ... + 670964.

It is an arithmetic number, because the mean of its divisors is an integer number (2590263312).

Almost surely, 2^20566990877 is an apocalyptic number.

It is an amenable number.

20566990877 is a deficient number, since it is larger than the sum of its proper divisors (155115619).

20566990877 is a wasteful number, since it uses less digits than its factorization.

20566990877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36307.

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 20566990877 in words is "twenty billion, five hundred sixty-six million, nine hundred ninety thousand, eight hundred seventy-seven".