13705720 has 64 divisors (see below), whose sum is σ = 36403200. Its totient is φ = 4544640.

The previous prime is 13705697. The next prime is 13705739. The reversal of 13705720 is 2750731.

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 15 ways as a sum of consecutive naturals, for example, 7891 + ... + 9469.

It is an arithmetic number, because the mean of its divisors is an integer number (568800).

Almost surely, 2^13705720 is an apocalyptic number.

13705720 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 13705720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18201600).

13705720 is an abundant number, since it is smaller than the sum of its proper divisors (22697480).

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

13705720 is a wasteful number, since it uses less digits than its factorization.

13705720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628 (or 1624 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 13705720 is about 3702.1237148426. The cubic root of 13705720 is about 239.3135477282.

The spelling of 13705720 in words is "thirteen million, seven hundred five thousand, seven hundred twenty".