19220217768 has 96 divisors (see below), whose sum is σ = 52651909440. Its totient is φ = 6333465600.

The previous prime is 19220217761. The next prime is 19220217811. The reversal of 19220217768 is 86771202291.

It is a happy number.

It is a Cunningham number, because it is equal to 138637²-1.

It is not an unprimeable number, because it can be changed into a prime (19220217761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4989043 + ... + 4992893.

It is an arithmetic number, because the mean of its divisors is an integer number (548457390).

Almost surely, 2^19220217768 is an apocalyptic number.

19220217768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19220217768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26325954720).

19220217768 is an abundant number, since it is smaller than the sum of its proper divisors (33431691672).

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

19220217768 is a wasteful number, since it uses less digits than its factorization.

19220217768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639 (or 4632 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 19220217768 in words is "nineteen billion, two hundred twenty million, two hundred seventeen thousand, seven hundred sixty-eight".