20320501 has 4 divisors (see below), whose sum is σ = 20358604. Its totient is φ = 20282400.

The previous prime is 20320483. The next prime is 20320507. The reversal of 20320501 is 10502302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4519876 + 15800625 = 2126^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320501 - 2⁷ = 20320373 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 (20320507) 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, 18240 + ... + 19321.

It is an arithmetic number, because the mean of its divisors is an integer number (5089651).

Almost surely, 2^20320501 is an apocalyptic number.

It is an amenable number.

20320501 is a deficient number, since it is larger than the sum of its proper divisors (38103).

20320501 is an equidigital number, since it uses as much as digits as its factorization.

20320501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38102.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20320501 is about 4507.8266381927. The cubic root of 20320501 is about 272.8840406142.

Adding to 20320501 its reverse (10502302), we get a palindrome (30822803).

The spelling of 20320501 in words is "twenty million, three hundred twenty thousand, five hundred one".