19982018920 has 32 divisors (see below), whose sum is σ = 45101399400. Its totient is φ = 7967588608.

The previous prime is 19982018897. The next prime is 19982018929. The reversal of 19982018920 is 2981028991.

It can be written as a sum of positive squares in 4 ways, for example, as 11050634884 + 8931384036 = 105122^2 + 94506^2 .

It is not an unprimeable number, because it can be changed into a prime (19982018929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775255 + ... + 800614.

Almost surely, 2^19982018920 is an apocalyptic number.

19982018920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19982018920 is an abundant number, since it is smaller than the sum of its proper divisors (25119380480).

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

19982018920 is a wasteful number, since it uses less digits than its factorization.

19982018920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576197 (or 1576193 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 49.

The spelling of 19982018920 in words is "nineteen billion, nine hundred eighty-two million, eighteen thousand, nine hundred twenty".