20568240 has 360 divisors, whose sum is σ = 89311248. Its totient is φ = 4193280.

The previous prime is 20568227. The next prime is 20568253. The reversal of 20568240 is 4286502.

It is an interprime number because it is at equal distance from previous prime (20568227) and next prime (20568253).

It is a tau number, because it is divible by the number of its divisors (360).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 388054 + ... + 388106.

Almost surely, 2^20568240 is an apocalyptic number.

20568240 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 20568240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44655624).

20568240 is an abundant number, since it is smaller than the sum of its proper divisors (68743008).

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

20568240 is a wasteful number, since it uses less digits than its factorization.

20568240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20568240 is about 4535.2221555289. Note that the first 3 decimals coincide. The cubic root of 20568240 is about 273.9885267009.

It can be divided in two parts, 2056 and 8240, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 20568240 in words is "twenty million, five hundred sixty-eight thousand, two hundred forty".