20528625 has 32 divisors (see below), whose sum is σ = 36796032. Its totient is φ = 10104000.

The previous prime is 20528623. The next prime is 20528647. The reversal of 20528625 is 52682502.

It is not a de Polignac number, because 20528625 - 2¹ = 20528623 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20528592 and 20528601.

It is not an unprimeable number, because it can be changed into a prime (20528623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2770 + ... + 6980.

It is an arithmetic number, because the mean of its divisors is an integer number (1149876).

Almost surely, 2^20528625 is an apocalyptic number.

20528625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20528625 is a deficient number, since it is larger than the sum of its proper divisors (16267407).

20528625 is a wasteful number, since it uses less digits than its factorization.

20528625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242 (or 4232 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 20528625 is about 4530.8525687778. The cubic root of 20528625 is about 273.8125104844.

The spelling of 20528625 in words is "twenty million, five hundred twenty-eight thousand, six hundred twenty-five".