16181620 has 96 divisors (see below), whose sum is σ = 44368128. Its totient is φ = 4810752.

The previous prime is 16181611. The next prime is 16181621. The reversal of 16181620 is 2618161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16181621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30679 + ... + 31201.

It is an arithmetic number, because the mean of its divisors is an integer number (462168).

Almost surely, 2^16181620 is an apocalyptic number.

16181620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16181620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22184064).

16181620 is an abundant number, since it is smaller than the sum of its proper divisors (28186508).

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

16181620 is a wasteful number, since it uses less digits than its factorization.

16181620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 16181620 is about 4022.6384376426. The cubic root of 16181620 is about 252.9340702147.

Adding to 16181620 its reverse (2618161), we get a palindrome (18799781).

The spelling of 16181620 in words is "sixteen million, one hundred eighty-one thousand, six hundred twenty".