20170390 has 16 divisors (see below), whose sum is σ = 36819360. Its totient is φ = 7954240.

The previous prime is 20170363. The next prime is 20170391. The reversal of 20170390 is 9307102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20170391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13495 + ... + 14914.

It is an arithmetic number, because the mean of its divisors is an integer number (2301210).

Almost surely, 2^20170390 is an apocalyptic number.

20170390 is a deficient number, since it is larger than the sum of its proper divisors (16648970).

20170390 is a wasteful number, since it uses less digits than its factorization.

20170390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28487.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20170390 is about 4491.1457335517. The cubic root of 20170390 is about 272.2104322412.

Adding to 20170390 its reverse (9307102), we get a palindrome (29477492).

The spelling of 20170390 in words is "twenty million, one hundred seventy thousand, three hundred ninety".