20550474018 has 12 divisors (see below), whose sum is σ = 44526027078. Its totient is φ = 6850158000.

The previous prime is 20550473989. The next prime is 20550474041. The reversal of 20550474018 is 81047405502.

20550474018 is a `hidden beast` number, since 20 + 550 + 4 + 74 + 0 + 18 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18345889809 + 2204584209 = 135447^2 + 46953^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 570846483 + ... + 570846518.

Almost surely, 2^20550474018 is an apocalyptic number.

20550474018 is an abundant number, since it is smaller than the sum of its proper divisors (23975553060).

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

20550474018 is a wasteful number, since it uses less digits than its factorization.

20550474018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141693009 (or 1141693006 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 20550474018 in words is "twenty billion, five hundred fifty million, four hundred seventy-four thousand, eighteen".