20381190 has 16 divisors (see below), whose sum is σ = 48914928. Its totient is φ = 5434976.

The previous prime is 20381177. The next prime is 20381201. The reversal of 20381190 is 9118302.

It is a super-2 number, since 2×20381190² = 830785811632200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20381190.

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, 339657 + ... + 339716.

It is an arithmetic number, because the mean of its divisors is an integer number (3057183).

Almost surely, 2^20381190 is an apocalyptic number.

20381190 is an abundant number, since it is smaller than the sum of its proper divisors (28533738).

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

20381190 is a wasteful number, since it uses less digits than its factorization.

20381190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679383.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 20381190 is about 4514.5531340322. The cubic root of 20381190 is about 273.1554348384.

Adding to 20381190 its reverse (9118302), we get a palindrome (29499492).

The spelling of 20381190 in words is "twenty million, three hundred eighty-one thousand, one hundred ninety".