20665555110 has 80 divisors (see below), whose sum is σ = 57359947392. Its totient is φ = 5333040000.

The previous prime is 20665555093. The next prime is 20665555153. The reversal of 20665555110 is 1155556602.

It is a super-2 number, since 2×20665555110² (a number of 21 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 39 ways as a sum of consecutive naturals, for example, 386391 + ... + 436610.

Almost surely, 2^20665555110 is an apocalyptic number.

20665555110 is an abundant number, since it is smaller than the sum of its proper divisors (36694392282).

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

20665555110 is a wasteful number, since it uses less digits than its factorization.

20665555110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823051 (or 823042 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 20665555110 in words is "twenty billion, six hundred sixty-five million, five hundred fifty-five thousand, one hundred ten".