19992644 has 36 divisors (see below), whose sum is σ = 41372352. Its totient is φ = 8280720.

The previous prime is 19992631. The next prime is 19992649. The reversal of 19992644 is 44629991.

It is a super-2 number, since 2×19992644² = 799411628221472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19992595 and 19992604.

It is not an unprimeable number, because it can be changed into a prime (19992649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26537 + ... + 27279.

It is an arithmetic number, because the mean of its divisors is an integer number (1149232).

Almost surely, 2^19992644 is an apocalyptic number.

19992644 is a gapful number since it is divisible by the number (14) 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 19992644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20686176).

19992644 is an abundant number, since it is smaller than the sum of its proper divisors (21379708).

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

19992644 is a wasteful number, since it uses less digits than its factorization.

19992644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 783 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 19992644 is about 4471.3134535615. The cubic root of 19992644 is about 271.4084788187.

The spelling of 19992644 in words is "nineteen million, nine hundred ninety-two thousand, six hundred forty-four".