20390495 has 4 divisors (see below), whose sum is σ = 24468600. Its totient is φ = 16312392.

The previous prime is 20390483. The next prime is 20390549. The reversal of 20390495 is 59409302.

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 20390495 - 2⁶ = 20390431 is a prime.

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, 2039045 + ... + 2039054.

It is an arithmetic number, because the mean of its divisors is an integer number (6117150).

Almost surely, 2^20390495 is an apocalyptic number.

20390495 is a deficient number, since it is larger than the sum of its proper divisors (4078105).

20390495 is an equidigital number, since it uses as much as digits as its factorization.

20390495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078104.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20390495 is about 4515.5835724743. The cubic root of 20390495 is about 273.1969980742.

Adding to 20390495 its reverse (59409302), we get a palindrome (79799797).

The spelling of 20390495 in words is "twenty million, three hundred ninety thousand, four hundred ninety-five".