20537219 has 2 divisors, whose sum is σ = 20537220. Its totient is φ = 20537218.

The previous prime is 20537213. The next prime is 20537227. The reversal of 20537219 is 91273502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20537219 - 2²⁰ = 19488643 is a prime.

It is a super-2 number, since 2×20537219² = 843554728507922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20537191 and 20537200.

It is not a weakly prime, because it can be changed into another prime (20537213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10268609 + 10268610.

It is an arithmetic number, because the mean of its divisors is an integer number (10268610).

Almost surely, 2^20537219 is an apocalyptic number.

20537219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20537219 is an equidigital number, since it uses as much as digits as its factorization.

20537219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20537219 is about 4531.8008561719. The cubic root of 20537219 is about 273.8507143164.

The spelling of 20537219 in words is "twenty million, five hundred thirty-seven thousand, two hundred nineteen".