20045628 has 18 divisors (see below), whose sum is σ = 50670984. Its totient is φ = 6681864.

The previous prime is 20045621. The next prime is 20045629. The reversal of 20045628 is 82654002.

20045628 is a `hidden beast` number, since 200 + 456 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 278376 + ... + 278447.

Almost surely, 2^20045628 is an apocalyptic number.

It is an amenable number.

20045628 is an abundant number, since it is smaller than the sum of its proper divisors (30625356).

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

20045628 is a wasteful number, since it uses less digits than its factorization.

20045628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556833 (or 556828 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20045628 is about 4477.2344142339. The cubic root of 20045628 is about 271.6480272925.

The spelling of 20045628 in words is "twenty million, forty-five thousand, six hundred twenty-eight".