190921920 has 112 divisors (see below), whose sum is σ = 692798208. Its totient is φ = 43637760.

The previous prime is 190921909. The next prime is 190921987. The reversal of 190921920 is 29129091.

It is a tau number, because it is divible by the number of its divisors (112).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 7486 + ... + 20925.

Almost surely, 2^190921920 is an apocalyptic number.

190921920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

190921920 is an abundant number, since it is smaller than the sum of its proper divisors (501876288).

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

190921920 is a wasteful number, since it uses less digits than its factorization.

190921920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28438 (or 28428 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 190921920 is about 13817.4498370720. The cubic root of 190921920 is about 575.8180366581.

It can be divided in two parts, 19092 and 1920, that added together give a palindrome (21012).

The spelling of 190921920 in words is "one hundred ninety million, nine hundred twenty-one thousand, nine hundred twenty".