20740680 has 96 divisors (see below), whose sum is σ = 71393400. Its totient is φ = 5203968.

The previous prime is 20740679. The next prime is 20740691. The reversal of 20740680 is 8604702.

It can be written as a sum of positive squares in 4 ways, for example, as 20738916 + 1764 = 4554^2 + 42^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4426 + ... + 7814.

Almost surely, 2^20740680 is an apocalyptic number.

20740680 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 20740680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35696700).

20740680 is an abundant number, since it is smaller than the sum of its proper divisors (50652720).

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

20740680 is a wasteful number, since it uses less digits than its factorization.

20740680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423 (or 3416 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20740680 is about 4554.1936717711. The cubic root of 20740680 is about 274.7520851097.

The spelling of 20740680 in words is "twenty million, seven hundred forty thousand, six hundred eighty".