19820957226 has 64 divisors (see below), whose sum is σ = 46066768896. Its totient is φ = 5568393600.

The previous prime is 19820957209. The next prime is 19820957257. The reversal of 19820957226 is 62275902891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1005081 + ... + 1024611.

It is an arithmetic number, because the mean of its divisors is an integer number (719793264).

Almost surely, 2^19820957226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19820957226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23033384448).

19820957226 is an abundant number, since it is smaller than the sum of its proper divisors (26245811670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19820957226 is a wasteful number, since it uses less digits than its factorization.

19820957226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19947.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 19820957226 in words is "nineteen billion, eight hundred twenty million, nine hundred fifty-seven thousand, two hundred twenty-six".