13820428 has 12 divisors (see below), whose sum is σ = 24237360. Its totient is φ = 6895472.

The previous prime is 13820407. The next prime is 13820431. The reversal of 13820428 is 82402831.

It is a junction number, because it is equal to n+sod(n) for n = 13820396 and 13820405.

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, 1423 + ... + 5446.

It is an arithmetic number, because the mean of its divisors is an integer number (2019780).

Almost surely, 2^13820428 is an apocalyptic number.

It is an amenable number.

13820428 is a deficient number, since it is larger than the sum of its proper divisors (10416932).

13820428 is a wasteful number, since it uses less digits than its factorization.

13820428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376 (or 7374 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 13820428 is about 3717.5836238073. The cubic root of 13820428 is about 239.9793269230.

The spelling of 13820428 in words is "thirteen million, eight hundred twenty thousand, four hundred twenty-eight".