20390107 has 4 divisors (see below), whose sum is σ = 20774880. Its totient is φ = 20005336.

The previous prime is 20390081. The next prime is 20390113. The reversal of 20390107 is 70109302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20390107 - 2¹⁵ = 20357339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20390147) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 192307 + ... + 192412.

It is an arithmetic number, because the mean of its divisors is an integer number (5193720).

Almost surely, 2^20390107 is an apocalyptic number.

20390107 is a deficient number, since it is larger than the sum of its proper divisors (384773).

20390107 is an equidigital number, since it uses as much as digits as its factorization.

20390107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384772.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20390107 is about 4515.5406099381. The cubic root of 20390107 is about 273.1952652225.

Adding to 20390107 its reverse (70109302), we get a palindrome (90499409).

The spelling of 20390107 in words is "twenty million, three hundred ninety thousand, one hundred seven".