13866820 has 24 divisors (see below), whose sum is σ = 31768128. Its totient is φ = 5042400.

The previous prime is 13866793. The next prime is 13866821. The reversal of 13866820 is 2866831.

13866820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (13866821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31296 + ... + 31735.

It is an arithmetic number, because the mean of its divisors is an integer number (1323672).

Almost surely, 2^13866820 is an apocalyptic number.

13866820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13866820 is an abundant number, since it is smaller than the sum of its proper divisors (17901308).

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

13866820 is a wasteful number, since it uses less digits than its factorization.

13866820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63051 (or 63049 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 13866820 is about 3723.8179332508. The cubic root of 13866820 is about 240.2475455099.

The spelling of 13866820 in words is "thirteen million, eight hundred sixty-six thousand, eight hundred twenty".