20423090 has 16 divisors (see below), whose sum is σ = 37107072. Its totient is φ = 8092464.

The previous prime is 20423087. The next prime is 20423129. The reversal of 20423090 is 9032402.

It is an unprimeable number.

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, 8474 + ... + 10613.

It is an arithmetic number, because the mean of its divisors is an integer number (2319192).

Almost surely, 2^20423090 is an apocalyptic number.

20423090 is a deficient number, since it is larger than the sum of its proper divisors (16683982).

20423090 is a wasteful number, since it uses less digits than its factorization.

20423090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19201.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20423090 is about 4519.1912993366. The cubic root of 20423090 is about 273.3424925875.

Adding to 20423090 its reverse (9032402), we get a palindrome (29455492).

The spelling of 20423090 in words is "twenty million, four hundred twenty-three thousand, ninety".