20009525 has 12 divisors (see below), whose sum is σ = 25220484. Its totient is φ = 15744000.

The previous prime is 20009513. The next prime is 20009531. The reversal of 20009525 is 52590002.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 7214596 + 12794929 = 2686^2 + 3577^2 .

It is not a de Polignac number, because 20009525 - 2¹² = 20005429 is a prime.

It is a super-3 number, since 3×20009525³ (a number of 23 digits) contains 333 as substring.

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 20009525.

It is a congruent number.

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, 5036 + ... + 8085.

It is an arithmetic number, because the mean of its divisors is an integer number (2101707).

Almost surely, 2^20009525 is an apocalyptic number.

20009525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20009525 is a deficient number, since it is larger than the sum of its proper divisors (5210959).

20009525 is a wasteful number, since it uses less digits than its factorization.

20009525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13192 (or 13187 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 20009525 is about 4473.2007556111. The cubic root of 20009525 is about 271.4848462002.

Adding to 20009525 its reverse (52590002), we get a palindrome (72599527).

The spelling of 20009525 in words is "twenty million, nine thousand, five hundred twenty-five".