20504293 has 4 divisors (see below), whose sum is σ = 21395808. Its totient is φ = 19612780.

The previous prime is 20504221. The next prime is 20504353. The reversal of 20504293 is 39240502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20504293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504203) 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, 445723 + ... + 445768.

It is an arithmetic number, because the mean of its divisors is an integer number (5348952).

Almost surely, 2^20504293 is an apocalyptic number.

20504293 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20504293 is a deficient number, since it is larger than the sum of its proper divisors (891515).

20504293 is an equidigital number, since it uses as much as digits as its factorization.

20504293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891514.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20504293 is about 4528.1666267928. The cubic root of 20504293 is about 273.7042869674.

Adding to 20504293 its reverse (39240502), we get a palindrome (59744795).

The spelling of 20504293 in words is "twenty million, five hundred four thousand, two hundred ninety-three".