19563940 has 48 divisors (see below), whose sum is σ = 47464704. Its totient is φ = 6694400.

The previous prime is 19563937. The next prime is 19563941. The reversal of 19563940 is 4936591.

It is a self number, because there is not a number n which added to its sum of digits gives 19563940.

It is not an unprimeable number, because it can be changed into a prime (19563941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125 + ... + 6355.

It is an arithmetic number, because the mean of its divisors is an integer number (988848).

Almost surely, 2^19563940 is an apocalyptic number.

19563940 is a gapful number since it is divisible by the number (10) 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 19563940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23732352).

19563940 is an abundant number, since it is smaller than the sum of its proper divisors (27900764).

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

19563940 is a wasteful number, since it uses less digits than its factorization.

19563940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5268 (or 5266 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 19563940 is about 4423.1142874676. The cubic root of 19563940 is about 269.4544999101.

It can be divided in two parts, 19563 and 940, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 19563940 in words is "nineteen million, five hundred sixty-three thousand, nine hundred forty".