13687820 has 24 divisors (see below), whose sum is σ = 28867104. Its totient is φ = 5451776.

The previous prime is 13687811. The next prime is 13687831. The reversal of 13687820 is 2878631.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3809 + ... + 6471.

It is an arithmetic number, because the mean of its divisors is an integer number (1202796).

Almost surely, 2^13687820 is an apocalyptic number.

13687820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13687820 is an abundant number, since it is smaller than the sum of its proper divisors (15179284).

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

13687820 is a wasteful number, since it uses less digits than its factorization.

13687820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929 (or 2927 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 13687820 is about 3699.7053936766. The cubic root of 13687820 is about 239.2093192568.

The spelling of 13687820 in words is "thirteen million, six hundred eighty-seven thousand, eight hundred twenty".