191020000 has 60 divisors (see below), whose sum is σ = 469987056. Its totient is φ = 76400000.

The previous prime is 191019971. The next prime is 191020001. The reversal of 191020000 is 20191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191020001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15225 + ... + 24775.

Almost surely, 2^191020000 is an apocalyptic number.

191020000 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 191020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234993528).

191020000 is an abundant number, since it is smaller than the sum of its proper divisors (278967056).

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

191020000 is an frugal number, since it uses more digits than its factorization.

191020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9581 (or 9558 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 191020000 is about 13820.9985167498. The cubic root of 191020000 is about 575.9166224479.

Adding to 191020000 its reverse (20191), we get a palindrome (191040191).

The spelling of 191020000 in words is "one hundred ninety-one million, twenty thousand".