20847568 has 40 divisors (see below), whose sum is σ = 48175488. Its totient is φ = 8545152.

The previous prime is 20847551. The next prime is 20847569. The reversal of 20847568 is 86574802.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20847568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20847569) 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, 1471 + ... + 6622.

Almost surely, 2^20847568 is an apocalyptic number.

20847568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20847568 is an abundant number, since it is smaller than the sum of its proper divisors (27327920).

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

20847568 is a wasteful number, since it uses less digits than its factorization.

20847568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8131 (or 8125 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 20847568 is about 4565.9137092153. The cubic root of 20847568 is about 275.2232589184.

The spelling of 20847568 in words is "twenty million, eight hundred forty-seven thousand, five hundred sixty-eight".