20568280 has 32 divisors (see below), whose sum is σ = 46517040. Its totient is φ = 8184960.

The previous prime is 20568277. The next prime is 20568287. The reversal of 20568280 is 8286502.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20568287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7222 + ... + 9658.

Almost surely, 2^20568280 is an apocalyptic number.

20568280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20568280 is an abundant number, since it is smaller than the sum of its proper divisors (25948760).

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

20568280 is a wasteful number, since it uses less digits than its factorization.

20568280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659 (or 2655 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20568280 is about 4535.2265654540. The cubic root of 20568280 is about 273.9887043135.

The spelling of 20568280 in words is "twenty million, five hundred sixty-eight thousand, two hundred eighty".