20387219 has 2 divisors, whose sum is σ = 20387220. Its totient is φ = 20387218.

The previous prime is 20387201. The next prime is 20387249. The reversal of 20387219 is 91278302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20387219 - 2¹² = 20383123 is a prime.

It is a super-2 number, since 2×20387219² = 831277397107922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20387249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10193609 + 10193610.

It is an arithmetic number, because the mean of its divisors is an integer number (10193610).

Almost surely, 2^20387219 is an apocalyptic number.

20387219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20387219 is an equidigital number, since it uses as much as digits as its factorization.

20387219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20387219 is about 4515.2208140909. The cubic root of 20387219 is about 273.1823663989.

The spelling of 20387219 in words is "twenty million, three hundred eighty-seven thousand, two hundred nineteen".