20191872 has 32 divisors (see below), whose sum is σ = 53635680. Its totient is φ = 6730496.

The previous prime is 20191867. The next prime is 20191879. The reversal of 20191872 is 27819102.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (20191879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25908 + ... + 26675.

It is an arithmetic number, because the mean of its divisors is an integer number (1676115).

Almost surely, 2^20191872 is an apocalyptic number.

It is an amenable number.

20191872 is an abundant number, since it is smaller than the sum of its proper divisors (33443808).

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

20191872 is an equidigital number, since it uses as much as digits as its factorization.

20191872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52600 (or 52588 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 20191872 is about 4493.5366917385. The cubic root of 20191872 is about 272.3070350630.

The spelling of 20191872 in words is "twenty million, one hundred ninety-one thousand, eight hundred seventy-two".