20808166245584 has 40 divisors (see below), whose sum is σ = 42814009904328. Its totient is φ = 9763021578240.

The previous prime is 20808166245553. The next prime is 20808166245661. The reversal of 20808166245584 is 48554266180802.

It can be written as a sum of positive squares in 4 ways, for example, as 6893565313600 + 13914600931984 = 2625560^2 + 3730228^2 .

It is a super-2 number, since 2×20808166245584² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113410727 + ... + 113594054.

Almost surely, 2^{20808166245584} is an apocalyptic number.

It is an amenable number.

20808166245584 is an abundant number, since it is smaller than the sum of its proper divisors (22005843658744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20808166245584 is a wasteful number, since it uses less digits than its factorization.

20808166245584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227005143 (or 227005137 counting only the distinct ones).

The product of its (nonzero) digits is 29491200, while the sum is 59.

The spelling of 20808166245584 in words is "twenty trillion, eight hundred eight billion, one hundred sixty-six million, two hundred forty-five thousand, five hundred eighty-four".