20869025 has 6 divisors (see below), whose sum is σ = 25877622. Its totient is φ = 16695200.

The previous prime is 20869003. The next prime is 20869091. The reversal of 20869025 is 52096802.

It can be written as a sum of positive squares in 3 ways, for example, as 2401 + 20866624 = 49^2 + 4568^2 .

It is not a de Polignac number, because 20869025 - 2⁶ = 20868961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20868982 and 20869000.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 417356 + ... + 417405.

It is an arithmetic number, because the mean of its divisors is an integer number (4312937).

Almost surely, 2^20869025 is an apocalyptic number.

20869025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20869025 is a deficient number, since it is larger than the sum of its proper divisors (5008597).

20869025 is an equidigital number, since it uses as much as digits as its factorization.

20869025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834771 (or 834766 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20869025 is about 4568.2627989204. The cubic root of 20869025 is about 275.3176494742.

It can be divided in two parts, 2086 and 9025, that added together give a palindrome (11111).

The spelling of 20869025 in words is "twenty million, eight hundred sixty-nine thousand, twenty-five".