20684412 has 72 divisors (see below), whose sum is σ = 60569600. Its totient is φ = 5829408.

The previous prime is 20684387. The next prime is 20684413. The reversal of 20684412 is 21448602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19389 + ... + 20427.

Almost surely, 2^20684412 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 20684412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30284800).

20684412 is an abundant number, since it is smaller than the sum of its proper divisors (39885188).

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

20684412 is a wasteful number, since it uses less digits than its factorization.

20684412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20684412 is about 4548.0118733354. The cubic root of 20684412 is about 274.5033990840.

The spelling of 20684412 in words is "twenty million, six hundred eighty-four thousand, four hundred twelve".