20312219 has 2 divisors, whose sum is σ = 20312220. Its totient is φ = 20312218.

The previous prime is 20312213. The next prime is 20312221. The reversal of 20312219 is 91221302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20312219 - 2¹⁶ = 20246683 is a prime.

It is a super-2 number, since 2×20312219² = 825172481407922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 20312221, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20312219.

It is not a weakly prime, because it can be changed into another prime (20312213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156109 + 10156110.

It is an arithmetic number, because the mean of its divisors is an integer number (10156110).

Almost surely, 2^20312219 is an apocalyptic number.

20312219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312219 is an equidigital number, since it uses as much as digits as its factorization.

20312219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20312219 is about 4506.9079200711. The cubic root of 20312219 is about 272.8469625794.

The spelling of 20312219 in words is "twenty million, three hundred twelve thousand, two hundred nineteen".