20624313 has 4 divisors (see below), whose sum is σ = 27499088. Its totient is φ = 13749540.

The previous prime is 20624311. The next prime is 20624321. The reversal of 20624313 is 31342602.

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 not a de Polignac number, because 20624313 - 2¹ = 20624311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20624313.

It is not an unprimeable number, because it can be changed into a prime (20624311) 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, 3437383 + ... + 3437388.

It is an arithmetic number, because the mean of its divisors is an integer number (6874772).

Almost surely, 2^20624313 is an apocalyptic number.

It is an amenable number.

20624313 is a deficient number, since it is larger than the sum of its proper divisors (6874775).

20624313 is an equidigital number, since it uses as much as digits as its factorization.

20624313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6874774.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20624313 is about 4541.3998943057. The cubic root of 20624313 is about 274.2372826892.

Adding to 20624313 its reverse (31342602), we get a palindrome (51966915).

The spelling of 20624313 in words is "twenty million, six hundred twenty-four thousand, three hundred thirteen".