20189240 has 32 divisors (see below), whose sum is σ = 46008000. Its totient is φ = 7972224.

The previous prime is 20189233. The next prime is 20189291. The reversal of 20189240 is 4298102.

It is a congruent number.

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, 35 + ... + 6354.

It is an arithmetic number, because the mean of its divisors is an integer number (1437750).

Almost surely, 2^20189240 is an apocalyptic number.

20189240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20189240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23004000).

20189240 is an abundant number, since it is smaller than the sum of its proper divisors (25818760).

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

20189240 is a wasteful number, since it uses less digits than its factorization.

20189240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6479 (or 6475 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20189240 is about 4493.2438171103. The cubic root of 20189240 is about 272.2952028555.

The spelling of 20189240 in words is "twenty million, one hundred eighty-nine thousand, two hundred forty".