20683424 has 48 divisors (see below), whose sum is σ = 43559208. Its totient is φ = 9633792.

The previous prime is 20683423. The next prime is 20683447. The reversal of 20683424 is 42438602.

It can be written as a sum of positive squares in 4 ways, for example, as 20611600 + 71824 = 4540^2 + 268^2 .

It is not an unprimeable number, because it can be changed into a prime (20683423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104894 + ... + 105090.

Almost surely, 2^20683424 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 20683424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21779604).

20683424 is an abundant number, since it is smaller than the sum of its proper divisors (22875784).

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

20683424 is a wasteful number, since it uses less digits than its factorization.

20683424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 20683424 is about 4547.9032531486. The cubic root of 20683424 is about 274.4990284227.

The spelling of 20683424 in words is "twenty million, six hundred eighty-three thousand, four hundred twenty-four".