20566992377 has 48 divisors (see below), whose sum is σ = 23885383680. Its totient is φ = 17598159360.

The previous prime is 20566992359. The next prime is 20566992389. The reversal of 20566992377 is 77329966502.

It is not a de Polignac number, because 20566992377 - 2¹⁴ = 20566975993 is a prime.

It is a super-2 number, since 2×20566992377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20566992337) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53699528 + ... + 53699910.

It is an arithmetic number, because the mean of its divisors is an integer number (497612160).

Almost surely, 2^20566992377 is an apocalyptic number.

It is an amenable number.

20566992377 is a deficient number, since it is larger than the sum of its proper divisors (3318391303).

20566992377 is a wasteful number, since it uses less digits than its factorization.

20566992377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 8573040, while the sum is 56.

The spelling of 20566992377 in words is "twenty billion, five hundred sixty-six million, nine hundred ninety-two thousand, three hundred seventy-seven".