20487619 has 2 divisors, whose sum is σ = 20487620. Its totient is φ = 20487618.

The previous prime is 20487617. The next prime is 20487631. The reversal of 20487619 is 91678402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20487619 - 2¹ = 20487617 is a prime.

It is a super-2 number, since 2×20487619² = 839485064578322, which contains 22 as substring.

Together with 20487617, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20487613) 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, 10243809 + 10243810.

It is an arithmetic number, because the mean of its divisors is an integer number (10243810).

Almost surely, 2^20487619 is an apocalyptic number.

20487619 is a deficient number, since it is larger than the sum of its proper divisors (1).

20487619 is an equidigital number, since it uses as much as digits as its factorization.

20487619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20487619 is about 4526.3251098435. The cubic root of 20487619 is about 273.6300751440.

The spelling of 20487619 in words is "twenty million, four hundred eighty-seven thousand, six hundred nineteen".