20628025 has 12 divisors (see below), whose sum is σ = 27904464. Its totient is φ = 15002000.

The previous prime is 20628011. The next prime is 20628029. The reversal of 20628025 is 52082602.

It is not a de Polignac number, because 20628025 - 2⁷ = 20627897 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20628029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37231 + ... + 37780.

It is an arithmetic number, because the mean of its divisors is an integer number (2325372).

Almost surely, 2^20628025 is an apocalyptic number.

20628025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20628025 is a deficient number, since it is larger than the sum of its proper divisors (7276439).

20628025 is a wasteful number, since it uses less digits than its factorization.

20628025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75032 (or 75027 counting only the distinct ones).

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

The square root of 20628025 is about 4541.8085604746. The cubic root of 20628025 is about 274.2537342711.

The spelling of 20628025 in words is "twenty million, six hundred twenty-eight thousand, twenty-five".