20191190500 has 72 divisors (see below), whose sum is σ = 47750812200. Its totient is φ = 7455177600.

The previous prime is 20191190471. The next prime is 20191190519. The reversal of 20191190500 is 509119102.

It can be written as a sum of positive squares in 12 ways, for example, as 19993394404 + 197796096 = 141398^2 + 14064^2 .

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, 34975 + ... + 203974.

It is an arithmetic number, because the mean of its divisors is an integer number (663205725).

Almost surely, 2^20191190500 is an apocalyptic number.

20191190500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20191190500 is an abundant number, since it is smaller than the sum of its proper divisors (27559621700).

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

20191190500 is a wasteful number, since it uses less digits than its factorization.

20191190500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238994 (or 238969 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 28.

The spelling of 20191190500 in words is "twenty billion, one hundred ninety-one million, one hundred ninety thousand, five hundred".