19869056 has 64 divisors (see below), whose sum is σ = 43843680. Its totient is φ = 8921088.

The previous prime is 19869049. The next prime is 19869061. The reversal of 19869056 is 65096891.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×19869056² = 789558772662272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19868998 and 19869016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49850 + ... + 50246.

Almost surely, 2^19869056 is an apocalyptic number.

19869056 is a gapful number since it is divisible by the number (16) 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 19869056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21921840).

19869056 is an abundant number, since it is smaller than the sum of its proper divisors (23974624).

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

19869056 is a wasteful number, since it uses less digits than its factorization.

19869056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 19869056 is about 4457.4719292442. The cubic root of 19869056 is about 270.8480695940.

The spelling of 19869056 in words is "nineteen million, eight hundred sixty-nine thousand, fifty-six".