20560640 has 36 divisors (see below), whose sum is σ = 49252224. Its totient is φ = 8223744.

The previous prime is 20560601. The next prime is 20560649. The reversal of 20560640 is 4606502.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20560649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6752 + ... + 9311.

Almost surely, 2^20560640 is an apocalyptic number.

20560640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20560640 is an abundant number, since it is smaller than the sum of its proper divisors (28691584).

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

20560640 is an equidigital number, since it uses as much as digits as its factorization.

20560640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16084 (or 16070 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20560640 is about 4534.3841919273. The cubic root of 20560640 is about 273.9547761333.

The spelling of 20560640 in words is "twenty million, five hundred sixty thousand, six hundred forty".