20042590 has 16 divisors (see below), whose sum is σ = 36586080. Its totient is φ = 7903840.

The previous prime is 20042579. The next prime is 20042597. The reversal of 20042590 is 9524002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042597) 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, 13405 + ... + 14824.

It is an arithmetic number, because the mean of its divisors is an integer number (2286630).

Almost surely, 2^20042590 is an apocalyptic number.

20042590 is a deficient number, since it is larger than the sum of its proper divisors (16543490).

20042590 is a wasteful number, since it uses less digits than its factorization.

20042590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28307.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20042590 is about 4476.8951294396. The cubic root of 20042590 is about 271.6343034620.

Adding to 20042590 its reverse (9524002), we get a palindrome (29566592).

The spelling of 20042590 in words is "twenty million, forty-two thousand, five hundred ninety".