16443020 has 48 divisors (see below), whose sum is σ = 38900736. Its totient is φ = 5784000.

The previous prime is 16443013. The next prime is 16443041. The reversal of 16443020 is 2034461.

It is a happy number.

It is a super-3 number, since 3×16443020³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 16442983 and 16443001.

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, 5615 + ... + 8025.

It is an arithmetic number, because the mean of its divisors is an integer number (810432).

Almost surely, 2^16443020 is an apocalyptic number.

16443020 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 16443020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19450368).

16443020 is an abundant number, since it is smaller than the sum of its proper divisors (22457716).

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

16443020 is a wasteful number, since it uses less digits than its factorization.

16443020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462 (or 2460 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 16443020 is about 4054.9993834771. Note that the first 3 decimals coincide. The cubic root of 16443020 is about 254.2887781356.

Adding to 16443020 its reverse (2034461), we get a palindrome (18477481).

It can be divided in two parts, 1644 and 3020, that added together give a palindrome (4664).

The spelling of 16443020 in words is "sixteen million, four hundred forty-three thousand, twenty".