20390935 has 4 divisors (see below), whose sum is σ = 24469128. Its totient is φ = 16312744.

The previous prime is 20390911. The next prime is 20390941. The reversal of 20390935 is 53909302.

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 20390935 - 2¹³ = 20382743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20390897 and 20390906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2039089 + ... + 2039098.

It is an arithmetic number, because the mean of its divisors is an integer number (6117282).

Almost surely, 2^20390935 is an apocalyptic number.

20390935 is a deficient number, since it is larger than the sum of its proper divisors (4078193).

20390935 is an equidigital number, since it uses as much as digits as its factorization.

20390935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078192.

The product of its (nonzero) digits is 7290, while the sum is 31.

The square root of 20390935 is about 4515.6322923817. The cubic root of 20390935 is about 273.1989631370.

The spelling of 20390935 in words is "twenty million, three hundred ninety thousand, nine hundred thirty-five".