13133820 has 48 divisors (see below), whose sum is σ = 42029568. Its totient is φ = 3001920.

The previous prime is 13133803. The next prime is 13133867. The reversal of 13133820 is 2833131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15216 + ... + 16055.

It is an arithmetic number, because the mean of its divisors is an integer number (875616).

Almost surely, 2^13133820 is an apocalyptic number.

13133820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13133820 is an abundant number, since it is smaller than the sum of its proper divisors (28895748).

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

13133820 is a wasteful number, since it uses less digits than its factorization.

13133820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31290 (or 31288 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 13133820 is about 3624.0612577604. The cubic root of 13133820 is about 235.9375253571.

Adding to 13133820 its reverse (2833131), we get a palindrome (15966951).

The spelling of 13133820 in words is "thirteen million, one hundred thirty-three thousand, eight hundred twenty".