20845219 has 2 divisors, whose sum is σ = 20845220. Its totient is φ = 20845218.

The previous prime is 20845217. The next prime is 20845267. The reversal of 20845219 is 91254802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20845219 - 2¹ = 20845217 is a prime.

It is a super-2 number, since 2×20845219² = 869046310315922, which contains 22 as substring.

Together with 20845217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20845217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10422609 + 10422610.

It is an arithmetic number, because the mean of its divisors is an integer number (10422610).

Almost surely, 2^20845219 is an apocalyptic number.

20845219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20845219 is an equidigital number, since it uses as much as digits as its factorization.

20845219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 20845219 is about 4565.6564697752. The cubic root of 20845219 is about 275.2129216021.

The spelling of 20845219 in words is "twenty million, eight hundred forty-five thousand, two hundred nineteen".