20372213 has 4 divisors (see below), whose sum is σ = 20438880. Its totient is φ = 20305548.

The previous prime is 20372179. The next prime is 20372249. The reversal of 20372213 is 31227302.

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-20372213 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 (20372263) 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, 32873 + ... + 33486.

It is an arithmetic number, because the mean of its divisors is an integer number (5109720).

Almost surely, 2^20372213 is an apocalyptic number.

It is an amenable number.

20372213 is a deficient number, since it is larger than the sum of its proper divisors (66667).

20372213 is an equidigital number, since it uses as much as digits as its factorization.

20372213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66666.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20372213 is about 4513.5587954518. The cubic root of 20372213 is about 273.1153247100.

Adding to 20372213 its reverse (31227302), we get a palindrome (51599515).

The spelling of 20372213 in words is "twenty million, three hundred seventy-two thousand, two hundred thirteen".