20320213 has 8 divisors (see below), whose sum is σ = 21259800. Its totient is φ = 19396608.

The previous prime is 20320211. The next prime is 20320241. The reversal of 20320213 is 31202302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 88209 + 20232004 = 297^2 + 4498^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20320213 - 2¹ = 20320211 is a prime.

It is a super-2 number, since 2×20320213² = 825822112730738, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20320193 and 20320202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356 + ... + 6517.

It is an arithmetic number, because the mean of its divisors is an integer number (2657475).

Almost surely, 2^20320213 is an apocalyptic number.

It is an amenable number.

20320213 is a deficient number, since it is larger than the sum of its proper divisors (939587).

20320213 is an equidigital number, since it uses as much as digits as its factorization.

20320213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7991.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20320213 is about 4507.7946936390. The cubic root of 20320213 is about 272.8827514240.

Adding to 20320213 its reverse (31202302), we get a palindrome (51522515).

The spelling of 20320213 in words is "twenty million, three hundred twenty thousand, two hundred thirteen".