20809004919 has 8 divisors (see below), whose sum is σ = 27755792880. Its totient is φ = 13867443456.

The previous prime is 20809004891. The next prime is 20809004933. The reversal of 20809004919 is 91940090802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20809004919 is a prime.

It is a super-2 number, since 2×20809004919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20809004959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1297324 + ... + 1313265.

It is an arithmetic number, because the mean of its divisors is an integer number (3469474110).

Almost surely, 2^20809004919 is an apocalyptic number.

20809004919 is a deficient number, since it is larger than the sum of its proper divisors (6946787961).

20809004919 is a wasteful number, since it uses less digits than its factorization.

20809004919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613249.

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 20809004919 in words is "twenty billion, eight hundred nine million, four thousand, nine hundred nineteen".