20019619 has 2 divisors, whose sum is σ = 20019620. Its totient is φ = 20019618.

The previous prime is 20019617. The next prime is 20019631. The reversal of 20019619 is 91691002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20019619 - 2¹ = 20019617 is a prime.

It is a super-2 number, since 2×20019619² = 801570289810322, which contains 22 as substring.

Together with 20019617, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20019617) 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, 10009809 + 10009810.

It is an arithmetic number, because the mean of its divisors is an integer number (10009810).

Almost surely, 2^20019619 is an apocalyptic number.

20019619 is a deficient number, since it is larger than the sum of its proper divisors (1).

20019619 is an equidigital number, since it uses as much as digits as its factorization.

20019619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 20019619 is about 4474.3288882245. The cubic root of 20019619 is about 271.5304895853.

The spelling of 20019619 in words is "twenty million, nineteen thousand, six hundred nineteen".