20180390 has 16 divisors (see below), whose sum is σ = 37098432. Its totient is φ = 7900224.

The previous prime is 20180389. The next prime is 20180393. The reversal of 20180390 is 9308102.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20180393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20999 + ... + 21938.

It is an arithmetic number, because the mean of its divisors is an integer number (2318652).

Almost surely, 2^20180390 is an apocalyptic number.

20180390 is a deficient number, since it is larger than the sum of its proper divisors (16918042).

20180390 is a wasteful number, since it uses less digits than its factorization.

20180390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42991.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20180390 is about 4492.2588972587. The cubic root of 20180390 is about 272.2554099634.

Adding to 20180390 its reverse (9308102), we get a palindrome (29488492).

The spelling of 20180390 in words is "twenty million, one hundred eighty thousand, three hundred ninety".