20845544 has 32 divisors (see below), whose sum is σ = 41065920. Its totient is φ = 9901056.

The previous prime is 20845543. The next prime is 20845579. The reversal of 20845544 is 44554802.

It is a self number, because there is not a number n which added to its sum of digits gives 20845544.

It is not an unprimeable number, because it can be changed into a prime (20845543) 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, 35219 + ... + 35805.

It is an arithmetic number, because the mean of its divisors is an integer number (1283310).

Almost surely, 2^20845544 is an apocalyptic number.

It is an amenable number.

20845544 is a deficient number, since it is larger than the sum of its proper divisors (20220376).

20845544 is a wasteful number, since it uses less digits than its factorization.

20845544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 32.

The square root of 20845544 is about 4565.6920614514. The cubic root of 20845544 is about 275.2143518858.

The spelling of 20845544 in words is "twenty million, eight hundred forty-five thousand, five hundred forty-four".