20215713 has 8 divisors (see below), whose sum is σ = 30804928. Its totient is φ = 11551824.

The previous prime is 20215711. The next prime is 20215721. The reversal of 20215713 is 31751202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20215713 - 2¹ = 20215711 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 962653 = 20215713 / (2 + 0 + 2 + 1 + 5 + 7 + 1 + 3).

It is a self number, because there is not a number n which added to its sum of digits gives 20215713.

It is not an unprimeable number, because it can be changed into a prime (20215711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481306 + ... + 481347.

It is an arithmetic number, because the mean of its divisors is an integer number (3850616).

Almost surely, 2^20215713 is an apocalyptic number.

It is an amenable number.

20215713 is a deficient number, since it is larger than the sum of its proper divisors (10589215).

20215713 is an equidigital number, since it uses as much as digits as its factorization.

20215713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962663.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20215713 is about 4496.1887193489. The cubic root of 20215713 is about 272.4141659354.

Adding to 20215713 its reverse (31751202), we get a palindrome (51966915).

The spelling of 20215713 in words is "twenty million, two hundred fifteen thousand, seven hundred thirteen".