100020111990 has 48 divisors (see below), whose sum is σ = 246711506832. Its totient is φ = 25951153536.

The previous prime is 100020111943. The next prime is 100020112001. The reversal of 100020111990 is 99111020001.

It is a super-3 number, since 3×100020111990³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100020111990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1176609 + ... + 1258748.

It is an arithmetic number, because the mean of its divisors is an integer number (5139823059).

Almost surely, 2^100020111990 is an apocalyptic number.

100020111990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100020111990 is an abundant number, since it is smaller than the sum of its proper divisors (146691394842).

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

100020111990 is a wasteful number, since it uses less digits than its factorization.

100020111990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435441 (or 2435404 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 24.

Adding to 100020111990 its reverse (99111020001), we get a palindrome (199131131991).

The spelling of 100020111990 in words is "one hundred billion, twenty million, one hundred eleven thousand, nine hundred ninety".