191020912020 has 72 divisors (see below), whose sum is σ = 579478876704. Its totient is φ = 50934621888.

The previous prime is 191020911997. The next prime is 191020912067. The reversal of 191020912020 is 20219020191.

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, 2501647 + ... + 2576873.

It is an arithmetic number, because the mean of its divisors is an integer number (8048317732).

Almost surely, 2^191020912020 is an apocalyptic number.

191020912020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191020912020 is an abundant number, since it is smaller than the sum of its proper divisors (388457964684).

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

191020912020 is a wasteful number, since it uses less digits than its factorization.

191020912020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89349 (or 89344 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 191020912020 in words is "one hundred ninety-one billion, twenty million, nine hundred twelve thousand, twenty".