100191020 has 24 divisors (see below), whose sum is σ = 211078224. Its totient is φ = 39947456.

The previous prime is 100191019. The next prime is 100191037. The reversal of 100191020 is 20191001.

It is a junction number, because it is equal to n+sod(n) for n = 100190986 and 100191004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1562 + ... + 14241.

It is an arithmetic number, because the mean of its divisors is an integer number (8794926).

Almost surely, 2^100191020 is an apocalyptic number.

100191020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100191020 is an abundant number, since it is smaller than the sum of its proper divisors (110887204).

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

100191020 is a wasteful number, since it uses less digits than its factorization.

100191020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16129 (or 16127 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 100191020 is about 10009.5464432710. The cubic root of 100191020 is about 464.4542408101.

The spelling of 100191020 in words is "one hundred million, one hundred ninety-one thousand, twenty".