20436525 has 36 divisors (see below), whose sum is σ = 37229140. Its totient is φ = 10713600.

The previous prime is 20436523. The next prime is 20436527. The reversal of 20436525 is 52563402.

20436525 is a `hidden beast` number, since 2 + 0 + 4 + 3 + 652 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (20436523) and next prime (20436527).

It can be written as a sum of positive squares in 6 ways, for example, as 6441444 + 13995081 = 2538^2 + 3741^2 .

It is not a de Polignac number, because 20436525 - 2¹ = 20436523 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20436523) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12981 + ... + 14469.

Almost surely, 2^20436525 is an apocalyptic number.

20436525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20436525 is a deficient number, since it is larger than the sum of its proper divisors (16792615).

20436525 is a wasteful number, since it uses less digits than its factorization.

20436525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566 (or 1558 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20436525 is about 4520.6774934737. The cubic root of 20436525 is about 273.4024174310.

Adding to 20436525 its reverse (52563402), we get a palindrome (72999927).

The spelling of 20436525 in words is "twenty million, four hundred thirty-six thousand, five hundred twenty-five".