16381320 has 32 divisors (see below), whose sum is σ = 49144320. Its totient is φ = 4368320.

The previous prime is 16381307. The next prime is 16381331. The reversal of 16381320 is 2318361.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 68136 + ... + 68375.

It is an arithmetic number, because the mean of its divisors is an integer number (1535760).

Almost surely, 2^16381320 is an apocalyptic number.

16381320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16381320 is an abundant number, since it is smaller than the sum of its proper divisors (32763000).

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

16381320 is a wasteful number, since it uses less digits than its factorization.

16381320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136525 (or 136521 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 16381320 is about 4047.3843405340. The cubic root of 16381320 is about 253.9703191391.

Adding to 16381320 its reverse (2318361), we get a palindrome (18699681).

It can be divided in two parts, 1638 and 1320, that multiplied together give a triangular number (2162160 = T₂₀₇₉).

The spelling of 16381320 in words is "sixteen million, three hundred eighty-one thousand, three hundred twenty".