20188260 has 72 divisors (see below), whose sum is σ = 64471680. Its totient is φ = 5099328.

The previous prime is 20188249. The next prime is 20188261. The reversal of 20188260 is 6288102.

It is not an unprimeable number, because it can be changed into a prime (20188261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 469 + ... + 6371.

It is an arithmetic number, because the mean of its divisors is an integer number (895440).

Almost surely, 2^20188260 is an apocalyptic number.

20188260 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 20188260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32235840).

20188260 is an abundant number, since it is smaller than the sum of its proper divisors (44283420).

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

20188260 is a wasteful number, since it uses less digits than its factorization.

20188260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5937 (or 5932 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20188260 is about 4493.1347631693. The cubic root of 20188260 is about 272.2907969836.

The spelling of 20188260 in words is "twenty million, one hundred eighty-eight thousand, two hundred sixty".