191700020 has 48 divisors (see below), whose sum is σ = 416199168. Its totient is φ = 74121600.

The previous prime is 191700013. The next prime is 191700053. The reversal of 191700020 is 20007191.

191700020 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 191699965 and 191700001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85757 + ... + 87963.

It is an arithmetic number, because the mean of its divisors is an integer number (8670816).

Almost surely, 2^191700020 is an apocalyptic number.

191700020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191700020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208099584).

191700020 is an abundant number, since it is smaller than the sum of its proper divisors (224499148).

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

191700020 is a wasteful number, since it uses less digits than its factorization.

191700020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360 (or 2358 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 191700020 is about 13845.5776333095. The cubic root of 191700020 is about 576.5992228845.

The spelling of 191700020 in words is "one hundred ninety-one million, seven hundred thousand, twenty".