1918191920020 has 24 divisors (see below), whose sum is σ = 4079192947200. Its totient is φ = 757564403232.

The previous prime is 1918191919961. The next prime is 1918191920033. The reversal of 1918191920020 is 200291918191.

It is a happy number.

It is a super-3 number, since 3×1918191920020³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607021180 + ... + 607024339.

It is an arithmetic number, because the mean of its divisors is an integer number (169966372800).

Almost surely, 2^{1918191920020} is an apocalyptic number.

1918191920020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1918191920020 is an abundant number, since it is smaller than the sum of its proper divisors (2161001027180).

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

1918191920020 is a wasteful number, since it uses less digits than its factorization.

1918191920020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214045607 (or 1214045605 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 43.

The spelling of 1918191920020 in words is "one trillion, nine hundred eighteen billion, one hundred ninety-one million, nine hundred twenty thousand, twenty".