20682240 has 80 divisors (see below), whose sum is σ = 66143088. Its totient is φ = 5513216.

The previous prime is 20682199. The next prime is 20682247. The reversal of 20682240 is 4228602.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20682240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20682247) 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, 6334 + ... + 9026.

Almost surely, 2^20682240 is an apocalyptic number.

20682240 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 20682240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33071544).

20682240 is an abundant number, since it is smaller than the sum of its proper divisors (45460848).

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

20682240 is an equidigital number, since it uses as much as digits as its factorization.

20682240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719 (or 2703 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20682240 is about 4547.7730814103. The cubic root of 20682240 is about 274.4937905238.

The spelling of 20682240 in words is "twenty million, six hundred eighty-two thousand, two hundred forty".