20389619 has 2 divisors, whose sum is σ = 20389620. Its totient is φ = 20389618.

The previous prime is 20389591. The next prime is 20389631. The reversal of 20389619 is 91698302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20389619 - 2⁸ = 20389363 is a prime.

It is a super-2 number, since 2×20389619² = 831473125930322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20389219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194809 + 10194810.

It is an arithmetic number, because the mean of its divisors is an integer number (10194810).

Almost surely, 2^20389619 is an apocalyptic number.

20389619 is a deficient number, since it is larger than the sum of its proper divisors (1).

20389619 is an equidigital number, since it uses as much as digits as its factorization.

20389619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 20389619 is about 4515.4865740029. The cubic root of 20389619 is about 273.1930857284.

The spelling of 20389619 in words is "twenty million, three hundred eighty-nine thousand, six hundred nineteen".