19713660 has 48 divisors (see below), whose sum is σ = 55910400. Its totient is φ = 5189184.

The previous prime is 19713643. The next prime is 19713667. The reversal of 19713660 is 6631791.

19713660 = 1476² + 1477² + ... + 1484².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19713667) 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, 2661 + ... + 6819.

It is an arithmetic number, because the mean of its divisors is an integer number (1164800).

Almost surely, 2^19713660 is an apocalyptic number.

19713660 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 19713660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27955200).

19713660 is an abundant number, since it is smaller than the sum of its proper divisors (36196740).

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

19713660 is a wasteful number, since it uses less digits than its factorization.

19713660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250 (or 4248 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 19713660 is about 4440.0067567516. The cubic root of 19713660 is about 270.1401193149.

The spelling of 19713660 in words is "nineteen million, seven hundred thirteen thousand, six hundred sixty".