16191920 has 40 divisors (see below), whose sum is σ = 38866560. Its totient is φ = 6266880.

The previous prime is 16191913. The next prime is 16191937. The reversal of 16191920 is 2919161.

16191920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785 + ... + 5744.

It is an arithmetic number, because the mean of its divisors is an integer number (971664).

Almost surely, 2^16191920 is an apocalyptic number.

16191920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16191920 is an abundant number, since it is smaller than the sum of its proper divisors (22674640).

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

16191920 is a wasteful number, since it uses less digits than its factorization.

16191920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6573 (or 6567 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 16191920 is about 4023.9184882400. The cubic root of 16191920 is about 252.9877250889.

The spelling of 16191920 in words is "sixteen million, one hundred ninety-one thousand, nine hundred twenty".