19973568 has 56 divisors (see below), whose sum is σ = 55156608. Its totient is φ = 6366976.

The previous prime is 19973549. The next prime is 19973573. The reversal of 19973568 is 86537991.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2155 + ... + 6677.

Almost surely, 2^19973568 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 19973568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27578304).

19973568 is an abundant number, since it is smaller than the sum of its proper divisors (35183040).

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

19973568 is a wasteful number, since it uses less digits than its factorization.

19973568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4561 (or 4551 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 19973568 is about 4469.1797905209. The cubic root of 19973568 is about 271.3221297981.

It can be divided in two parts, 1997 and 3568, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 19973568 in words is "nineteen million, nine hundred seventy-three thousand, five hundred sixty-eight".