Search a number
-
+
20523425 = 521363149
BaseRepresentation
bin100111001001…
…0100110100001
31102121200211212
41032102212201
520223222200
62011515505
7336306026
oct116224641
942550755
1020523425
111064860a
126a58b95
134337750
142a2354d
151c06035
hex13929a1

20523425 has 12 divisors (see below), whose sum is σ = 27407100. Its totient is φ = 15155520.

The previous prime is 20523421. The next prime is 20523431. The reversal of 20523425 is 52432502.

It can be written as a sum of positive squares in 6 ways, for example, as 4129024 + 16394401 = 2032^2 + 4049^2 .

It is not a de Polignac number, because 20523425 - 22 = 20523421 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20523425.

It is not an unprimeable number, because it can be changed into a prime (20523421) by changing a digit.

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, 31250 + ... + 31899.

It is an arithmetic number, because the mean of its divisors is an integer number (2283925).

Almost surely, 220523425 is an apocalyptic number.

20523425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20523425 is a deficient number, since it is larger than the sum of its proper divisors (6883675).

20523425 is a wasteful number, since it uses less digits than its factorization.

20523425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63172 (or 63167 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20523425 is about 4530.2786889992. The cubic root of 20523425 is about 273.7893891877.

Adding to 20523425 its reverse (52432502), we get a palindrome (72955927).

The spelling of 20523425 in words is "twenty million, five hundred twenty-three thousand, four hundred twenty-five".

Divisors: 1 5 13 25 65 325 63149 315745 820937 1578725 4104685 20523425