13671820 has 12 divisors (see below), whose sum is σ = 28710864. Its totient is φ = 5468720.

The previous prime is 13671809. The next prime is 13671829. The reversal of 13671820 is 2817631.

It is a super-2 number, since 2×13671820² = 373837324224800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13671829) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 341776 + ... + 341815.

It is an arithmetic number, because the mean of its divisors is an integer number (2392572).

Almost surely, 2^13671820 is an apocalyptic number.

13671820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13671820 is an abundant number, since it is smaller than the sum of its proper divisors (15039044).

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

13671820 is a wasteful number, since it uses less digits than its factorization.

13671820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683600 (or 683598 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 13671820 is about 3697.5424270723. The cubic root of 13671820 is about 239.1160772024.

The spelling of 13671820 in words is "thirteen million, six hundred seventy-one thousand, eight hundred twenty".