20804619 has 24 divisors (see below), whose sum is σ = 31334800. Its totient is φ = 12260160.

The previous prime is 20804611. The next prime is 20804653. The reversal of 20804619 is 91640802.

It is not a de Polignac number, because 20804619 - 2³ = 20804611 is a prime.

It is a super-2 number, since 2×20804619² = 865664343470322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20804611) 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 in 23 ways as a sum of consecutive naturals, for example, 12657 + ... + 14205.

Almost surely, 2^20804619 is an apocalyptic number.

20804619 is a deficient number, since it is larger than the sum of its proper divisors (10530181).

20804619 is a wasteful number, since it uses less digits than its factorization.

20804619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611 (or 1600 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20804619 is about 4561.2080636603. The cubic root of 20804619 is about 275.0341290975.

The spelling of 20804619 in words is "twenty million, eight hundred four thousand, six hundred nineteen".