20189472 has 96 divisors (see below), whose sum is σ = 57153600. Its totient is φ = 6217728.

The previous prime is 20189471. The next prime is 20189479. The reversal of 20189472 is 27498102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×20189472² = 815229559277568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20189471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145179 + ... + 145317.

It is an arithmetic number, because the mean of its divisors is an integer number (595350).

Almost surely, 2^20189472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20189472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28576800).

20189472 is an abundant number, since it is smaller than the sum of its proper divisors (36964128).

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

20189472 is a wasteful number, since it uses less digits than its factorization.

20189472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20189472 is about 4493.2696335742. The cubic root of 20189472 is about 272.2962458573.

The spelling of 20189472 in words is "twenty million, one hundred eighty-nine thousand, four hundred seventy-two".