20628885 has 16 divisors (see below), whose sum is σ = 33065280. Its totient is φ = 10982400.

The previous prime is 20628859. The next prime is 20628887. The reversal of 20628885 is 58882602.

It is not a de Polignac number, because 20628885 - 2⁶ = 20628821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628887) 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 15 ways as a sum of consecutive naturals, for example, 12085 + ... + 13685.

It is an arithmetic number, because the mean of its divisors is an integer number (2066580).

Almost surely, 2^20628885 is an apocalyptic number.

It is an amenable number.

20628885 is a deficient number, since it is larger than the sum of its proper divisors (12436395).

20628885 is a wasteful number, since it uses less digits than its factorization.

20628885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468.

The product of its (nonzero) digits is 61440, while the sum is 39.

The square root of 20628885 is about 4541.9032354290. The cubic root of 20628885 is about 274.2575455091.

The spelling of 20628885 in words is "twenty million, six hundred twenty-eight thousand, eight hundred eighty-five".