13660420 has 12 divisors (see below), whose sum is σ = 28686924. Its totient is φ = 5464160.

The previous prime is 13660403. The next prime is 13660441. The reversal of 13660420 is 2406631.

It can be written as a sum of positive squares in 2 ways, for example, as 4910656 + 8749764 = 2216^2 + 2958^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13660391 and 13660400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341491 + ... + 341530.

It is an arithmetic number, because the mean of its divisors is an integer number (2390577).

Almost surely, 2^13660420 is an apocalyptic number.

13660420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13660420 is an abundant number, since it is smaller than the sum of its proper divisors (15026504).

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

13660420 is a wasteful number, since it uses less digits than its factorization.

13660420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683030 (or 683028 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 13660420 is about 3696.0005411255. Note that the first 3 decimals coincide. The cubic root of 13660420 is about 239.0495978484.

The spelling of 13660420 in words is "thirteen million, six hundred sixty thousand, four hundred twenty".