20008390 has 16 divisors (see below), whose sum is σ = 37581408. Its totient is φ = 7655296.

The previous prime is 20008381. The next prime is 20008447. The reversal of 20008390 is 9380002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43267 + ... + 43726.

It is an arithmetic number, because the mean of its divisors is an integer number (2348838).

Almost surely, 2^20008390 is an apocalyptic number.

20008390 is a deficient number, since it is larger than the sum of its proper divisors (17573018).

20008390 is a wasteful number, since it uses less digits than its factorization.

20008390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87023.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20008390 is about 4473.0738871608. The cubic root of 20008390 is about 271.4797129595.

Adding to 20008390 its reverse (9380002), we get a palindrome (29388392).

The spelling of 20008390 in words is "twenty million, eight thousand, three hundred ninety".