20190 has 16 divisors (see below), whose sum is σ = 48528. Its totient is φ = 5376.

The previous prime is 20183. The next prime is 20201. The reversal of 20190 is 9102.

It is a happy number.

It is a super-2 number, since 2×20190² = 815272200, which contains 22 as substring.

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, 307 + ... + 366.

It is an arithmetic number, because the mean of its divisors is an integer number (3033).

2²⁰¹⁹⁰ is an apocalyptic number.

20190 is an abundant number, since it is smaller than the sum of its proper divisors (28338).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24264).

20190 is a wasteful number, since it uses less digits than its factorization.

20190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 20190 is about 142.0915198033. The cubic root of 20190 is about 27.2298619556.

Adding to 20190 its sum of digits (12), we get a palindrome (20202).

Adding to 20190 its reverse (9102), we get a palindrome (29292).

It can be divided in two parts, 20 and 190, that added together give a triangular number (210 = T₂₀).

The spelling of 20190 in words is "twenty thousand, one hundred ninety".