191620 has 48 divisors (see below), whose sum is σ = 479808. Its totient is φ = 63360.

The previous prime is 191599. The next prime is 191621. The reversal of 191620 is 26191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191621) by changing a digit.

191620 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2827 + ... + 2893.

It is an arithmetic number, because the mean of its divisors is an integer number (9996).

2¹⁹¹⁶²⁰ is an apocalyptic number.

191620 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 191620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239904).

191620 is an abundant number, since it is smaller than the sum of its proper divisors (288188).

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

191620 is a wasteful number, since it uses less digits than its factorization.

191620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 191620 is about 437.7442175518. The cubic root of 191620 is about 57.6518983124.

It can be divided in two parts, 1916 and 20, that added together give a square (1936 = 44²).

The spelling of 191620 in words is "one hundred ninety-one thousand, six hundred twenty".