20943616 has 36 divisors (see below), whose sum is σ = 43635312. Its totient is φ = 10013696.

The previous prime is 20943613. The next prime is 20943617. The reversal of 20943616 is 61634902.

It is not an unprimeable number, because it can be changed into a prime (20943613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4110 + ... + 7666.

It is an arithmetic number, because the mean of its divisors is an integer number (1212092).

Almost surely, 2^20943616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20943616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21817656).

20943616 is an abundant number, since it is smaller than the sum of its proper divisors (22691696).

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

20943616 is an equidigital number, since it uses as much as digits as its factorization.

20943616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3596 (or 3582 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20943616 is about 4576.4195611854. The cubic root of 20943616 is about 275.6452769845.

The spelling of 20943616 in words is "twenty million, nine hundred forty-three thousand, six hundred sixteen".