19820919911 has 8 divisors (see below), whose sum is σ = 21866231184. Its totient is φ = 17849983680.

The previous prime is 19820919907. The next prime is 19820919917. The reversal of 19820919911 is 11991902891.

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

It is a cyclic number.

It is not a de Polignac number, because 19820919911 - 2² = 19820919907 is a prime.

It is a super-2 number, since 2×19820919911² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19820919911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19820919917) 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, 18593201 + ... + 18594266.

It is an arithmetic number, because the mean of its divisors is an integer number (2733278898).

Almost surely, 2^19820919911 is an apocalyptic number.

19820919911 is a deficient number, since it is larger than the sum of its proper divisors (2045311273).

19820919911 is a wasteful number, since it uses less digits than its factorization.

19820919911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37187521.

The product of its (nonzero) digits is 104976, while the sum is 50.

The spelling of 19820919911 in words is "nineteen billion, eight hundred twenty million, nine hundred nineteen thousand, nine hundred eleven".