20112551550 has 144 divisors (see below), whose sum is σ = 66505639200. Its totient is φ = 4243518720.

The previous prime is 20112551531. The next prime is 20112551609. The reversal of 20112551550 is 5515521102.

20112551550 is a `hidden beast` number, since 20 + 1 + 125 + 515 + 5 + 0 = 666.

It is a super-4 number, since 4×20112551550⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 204625 + ... + 286524.

Almost surely, 2^20112551550 is an apocalyptic number.

20112551550 is an abundant number, since it is smaller than the sum of its proper divisors (46393087650).

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

20112551550 is a wasteful number, since it uses less digits than its factorization.

20112551550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491187 (or 491179 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The spelling of 20112551550 in words is "twenty billion, one hundred twelve million, five hundred fifty-one thousand, five hundred fifty".