19820448269 has 4 divisors (see below), whose sum is σ = 20459817600. Its totient is φ = 19181078940.

The previous prime is 19820448229. The next prime is 19820448301. The reversal of 19820448269 is 96284402891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96284402891 = 53 ⋅1816686847.

It is a cyclic number.

It is not a de Polignac number, because 19820448269 - 2³² = 15525480973 is a prime.

It is a super-2 number, since 2×19820448269² (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 19820448269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19820448229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319684619 + ... + 319684680.

It is an arithmetic number, because the mean of its divisors is an integer number (5114954400).

Almost surely, 2^19820448269 is an apocalyptic number.

It is an amenable number.

19820448269 is a deficient number, since it is larger than the sum of its proper divisors (639369331).

19820448269 is an equidigital number, since it uses as much as digits as its factorization.

19820448269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639369330.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 19820448269 in words is "nineteen billion, eight hundred twenty million, four hundred forty-eight thousand, two hundred sixty-nine".