20043660 has 96 divisors (see below), whose sum is σ = 69092352. Its totient is φ = 4227840.

The previous prime is 20043641. The next prime is 20043691. The reversal of 20043660 is 6634002.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3625 + ... + 7295.

It is an arithmetic number, because the mean of its divisors is an integer number (719712).

Almost surely, 2^20043660 is an apocalyptic number.

20043660 is a gapful number since it is divisible by the number (20) 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 20043660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34546176).

20043660 is an abundant number, since it is smaller than the sum of its proper divisors (49048692).

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

20043660 is a wasteful number, since it uses less digits than its factorization.

20043660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3703 (or 3701 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20043660 is about 4477.0146303089. The cubic root of 20043660 is about 271.6391372274.

Adding to 20043660 its reverse (6634002), we get a palindrome (26677662).

The spelling of 20043660 in words is "twenty million, forty-three thousand, six hundred sixty".