20577886085 has 8 divisors (see below), whose sum is σ = 24772358040. Its totient is φ = 16409712384.

The previous prime is 20577886081. The next prime is 20577886111. The reversal of 20577886085 is 58068877502.

It can be written as a sum of positive squares in 4 ways, for example, as 987404929 + 19590481156 = 31423^2 + 139966^2 .

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 20577886085 - 2² = 20577886081 is a prime.

It is a super-4 number, since 4×20577886085⁴ (a number of 42 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20577886085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20577886081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6572840 + ... + 6575969.

It is an arithmetic number, because the mean of its divisors is an integer number (3096544755).

Almost surely, 2^20577886085 is an apocalyptic number.

It is an amenable number.

20577886085 is a deficient number, since it is larger than the sum of its proper divisors (4194471955).

20577886085 is a wasteful number, since it uses less digits than its factorization.

20577886085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13149127.

The product of its (nonzero) digits is 7526400, while the sum is 56.

The spelling of 20577886085 in words is "twenty billion, five hundred seventy-seven million, eight hundred eighty-six thousand, eighty-five".