20390080 has 28 divisors (see below), whose sum is σ = 48554640. Its totient is φ = 8155904.

The previous prime is 20390077. The next prime is 20390081. The reversal of 20390080 is 8009302.

It is not an unprimeable number, because it can be changed into a prime (20390081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31540 + ... + 32179.

Almost surely, 2^20390080 is an apocalyptic number.

20390080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20390080 is an abundant number, since it is smaller than the sum of its proper divisors (28164560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20390080 is an equidigital number, since it uses as much as digits as its factorization.

20390080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63736 (or 63726 counting only the distinct ones).

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

The square root of 20390080 is about 4515.5376202618. The cubic root of 20390080 is about 273.1951446367.

Adding to 20390080 its reverse (8009302), we get a palindrome (28399382).

The spelling of 20390080 in words is "twenty million, three hundred ninety thousand, eighty".