20501825 has 6 divisors (see below), whose sum is σ = 25422294. Its totient is φ = 16401440.

The previous prime is 20501807. The next prime is 20501839. The reversal of 20501825 is 52810502.

It can be written as a sum of positive squares in 3 ways, for example, as 323761 + 20178064 = 569^2 + 4492^2 .

It is not a de Polignac number, because 20501825 - 2¹⁴ = 20485441 is a prime.

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 20501825.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 410012 + ... + 410061.

It is an arithmetic number, because the mean of its divisors is an integer number (4237049).

Almost surely, 2^20501825 is an apocalyptic number.

20501825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20501825 is a deficient number, since it is larger than the sum of its proper divisors (4920469).

20501825 is an equidigital number, since it uses as much as digits as its factorization.

20501825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820083 (or 820078 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20501825 is about 4527.8941021186. The cubic root of 20501825 is about 273.6933050511.

The spelling of 20501825 in words is "twenty million, five hundred one thousand, eight hundred twenty-five".