20028625 has 16 divisors (see below), whose sum is σ = 25174656. Its totient is φ = 15908400.

The previous prime is 20028611. The next prime is 20028629. The reversal of 20028625 is 52682002.

It is not a de Polignac number, because 20028625 - 2¹¹ = 20026577 is a prime.

It is a super-2 number, since 2×20028625² = 802291638781250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20028625.

It is not an unprimeable number, because it can be changed into a prime (20028629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19884 + ... + 20866.

It is an arithmetic number, because the mean of its divisors is an integer number (1573416).

Almost surely, 2^20028625 is an apocalyptic number.

20028625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20028625 is a deficient number, since it is larger than the sum of its proper divisors (5146031).

20028625 is an equidigital number, since it uses as much as digits as its factorization.

20028625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161 (or 1151 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20028625 is about 4475.3351829779. The cubic root of 20028625 is about 271.5712002666.

The spelling of 20028625 in words is "twenty million, twenty-eight thousand, six hundred twenty-five".