20531587266 has 20 divisors (see below), whose sum is σ = 46005964422. Its totient is φ = 6843862368.

The previous prime is 20531587247. The next prime is 20531587273. The reversal of 20531587266 is 66278513502.

20531587266 is a `hidden beast` number, since 2 + 0 + 5 + 3 + 1 + 587 + 2 + 66 = 666.

20531587266 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 20397838041 + 133749225 = 142821^2 + 11565^2 .

It is a super-2 number, since 2×20531587266² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 63368935 + ... + 63369258.

Almost surely, 2^20531587266 is an apocalyptic number.

20531587266 is an abundant number, since it is smaller than the sum of its proper divisors (25474377156).

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

20531587266 is a wasteful number, since it uses less digits than its factorization.

20531587266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126738207 (or 126738198 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 20531587266 in words is "twenty billion, five hundred thirty-one million, five hundred eighty-seven thousand, two hundred sixty-six".