20185880 has 64 divisors (see below), whose sum is σ = 53373600. Its totient is φ = 6773760.

The previous prime is 20185873. The next prime is 20185883. The reversal of 20185880 is 8858102.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20185883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3956 + ... + 7484.

Almost surely, 2^20185880 is an apocalyptic number.

20185880 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 20185880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26686800).

20185880 is an abundant number, since it is smaller than the sum of its proper divisors (33187720).

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

20185880 is a wasteful number, since it uses less digits than its factorization.

20185880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564 (or 3560 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 20185880 is about 4492.8699068635. The cubic root of 20185880 is about 272.2800964153.

The spelling of 20185880 in words is "twenty million, one hundred eighty-five thousand, eight hundred eighty".