20186090 has 32 divisors (see below), whose sum is σ = 37797840. Its totient is φ = 7755264.

The previous prime is 20186071. The next prime is 20186093. The reversal of 20186090 is 9068102.

It can be written as a sum of positive squares in 8 ways, for example, as 3236401 + 16949689 = 1799^2 + 4117^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20186093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32624 + ... + 33236.

Almost surely, 2^20186090 is an apocalyptic number.

20186090 is a deficient number, since it is larger than the sum of its proper divisors (17611750).

20186090 is a wasteful number, since it uses less digits than its factorization.

20186090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20186090 is about 4492.8932771656. The cubic root of 20186090 is about 272.2810406169.

The spelling of 20186090 in words is "twenty million, one hundred eighty-six thousand, ninety".