20425390 has 16 divisors (see below), whose sum is σ = 36868608. Its totient is φ = 8147296.

The previous prime is 20425343. The next prime is 20425397. The reversal of 20425390 is 9352402.

It is a happy number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425397) 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, 1164 + ... + 6496.

It is an arithmetic number, because the mean of its divisors is an integer number (2304288).

Almost surely, 2^20425390 is an apocalyptic number.

20425390 is a deficient number, since it is larger than the sum of its proper divisors (16443218).

20425390 is a wasteful number, since it uses less digits than its factorization.

20425390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5723.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20425390 is about 4519.4457624802. The cubic root of 20425390 is about 273.3527532636.

Adding to 20425390 its reverse (9352402), we get a palindrome (29777792).

The spelling of 20425390 in words is "twenty million, four hundred twenty-five thousand, three hundred ninety".