20844628 has 12 divisors (see below), whose sum is σ = 41689312. Its totient is φ = 8933400.

The previous prime is 20844623. The next prime is 20844661. The reversal of 20844628 is 82644802.

20844628 is an admirable number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20844593 and 20844602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20844623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372198 + ... + 372253.

Almost surely, 2^20844628 is an apocalyptic number.

20844628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20844628 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20844628 is a wasteful number, since it uses less digits than its factorization.

20844628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744462 (or 744460 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 20844628 is about 4565.5917469699. The cubic root of 20844628 is about 275.2103206480.

The spelling of 20844628 in words is "twenty million, eight hundred forty-four thousand, six hundred twenty-eight".