19864204056 has 288 divisors, whose sum is σ = 59483548800. Its totient is φ = 5980677120.

The previous prime is 19864204051. The next prime is 19864204057. The reversal of 19864204056 is 65040246891.

It is a super-2 number, since 2×19864204056² (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 (19864204051) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 71711790 + ... + 71712066.

It is an arithmetic number, because the mean of its divisors is an integer number (206540100).

Almost surely, 2^19864204056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19864204056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29741774400).

19864204056 is an abundant number, since it is smaller than the sum of its proper divisors (39619344744).

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

19864204056 is a wasteful number, since it uses less digits than its factorization.

19864204056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 19864204056 in words is "nineteen billion, eight hundred sixty-four million, two hundred four thousand, fifty-six".