20404190 has 16 divisors (see below), whose sum is σ = 36798192. Its totient is φ = 8145984.

The previous prime is 20404187. The next prime is 20404213. The reversal of 20404190 is 9140402.

It is a super-2 number, since 2×20404190² = 832661939112200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4517 + ... + 7823.

It is an arithmetic number, because the mean of its divisors is an integer number (2299887).

Almost surely, 2^20404190 is an apocalyptic number.

20404190 is a deficient number, since it is larger than the sum of its proper divisors (16394002).

20404190 is a wasteful number, since it uses less digits than its factorization.

20404190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3931.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20404190 is about 4517.0997332359. The cubic root of 20404190 is about 273.2581474082.

Adding to 20404190 its reverse (9140402), we get a palindrome (29544592).

The spelling of 20404190 in words is "twenty million, four hundred four thousand, one hundred ninety".