20304619 has 2 divisors, whose sum is σ = 20304620. Its totient is φ = 20304618.

The previous prime is 20304617. The next prime is 20304667. The reversal of 20304619 is 91640302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20304619 - 2¹ = 20304617 is a prime.

It is a super-2 number, since 2×20304619² = 824555105470322, which contains 22 as substring.

Together with 20304617, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20304593 and 20304602.

It is not a weakly prime, because it can be changed into another prime (20304617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152309 + 10152310.

It is an arithmetic number, because the mean of its divisors is an integer number (10152310).

Almost surely, 2^20304619 is an apocalyptic number.

20304619 is a deficient number, since it is larger than the sum of its proper divisors (1).

20304619 is an equidigital number, since it uses as much as digits as its factorization.

20304619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20304619 is about 4506.0646910580. The cubic root of 20304619 is about 272.8129289501.

The spelling of 20304619 in words is "twenty million, three hundred four thousand, six hundred nineteen".