20161825 has 12 divisors (see below), whose sum is σ = 25534080. Its totient is φ = 15785360.

The previous prime is 20161807. The next prime is 20161837. The reversal of 20161825 is 52816102.

It is not a de Polignac number, because 20161825 - 2⁷ = 20161697 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20161825.

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 11 ways as a sum of consecutive naturals, for example, 7405 + ... + 9754.

It is an arithmetic number, because the mean of its divisors is an integer number (2127840).

Almost surely, 2^20161825 is an apocalyptic number.

20161825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20161825 is a deficient number, since it is larger than the sum of its proper divisors (5372255).

20161825 is a wasteful number, since it uses less digits than its factorization.

20161825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17216 (or 17211 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 20161825 is about 4490.1920894323. The cubic root of 20161825 is about 272.1718970015.

Adding to 20161825 its reverse (52816102), we get a palindrome (72977927).

It can be divided in two parts, 201 and 61825, that added together give a palindrome (62026).

The spelling of 20161825 in words is "twenty million, one hundred sixty-one thousand, eight hundred twenty-five".