19927945818 has 24 divisors (see below), whose sum is σ = 47102417856. Its totient is φ = 6038771400.

The previous prime is 19927945813. The next prime is 19927945823. The reversal of 19927945818 is 81854972991.

19927945818 is a `hidden beast` number, since 19 + 92 + 79 + 458 + 18 = 666.

It is an interprime number because it is at equal distance from previous prime (19927945813) and next prime (19927945823).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19927945813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50322898 + ... + 50323293.

It is an arithmetic number, because the mean of its divisors is an integer number (1962600744).

Almost surely, 2^19927945818 is an apocalyptic number.

19927945818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19927945818 is an abundant number, since it is smaller than the sum of its proper divisors (27174472038).

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

19927945818 is a wasteful number, since it uses less digits than its factorization.

19927945818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100646210 (or 100646207 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 19927945818 in words is "nineteen billion, nine hundred twenty-seven million, nine hundred forty-five thousand, eight hundred eighteen".