20145525 has 12 divisors (see below), whose sum is σ = 33307392. Its totient is φ = 10744240.

The previous prime is 20145509. The next prime is 20145547. The reversal of 20145525 is 52554102.

It is a happy number.

It is not a de Polignac number, because 20145525 - 2⁴ = 20145509 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20145495 and 20145504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134229 + ... + 134378.

It is an arithmetic number, because the mean of its divisors is an integer number (2775616).

Almost surely, 2^20145525 is an apocalyptic number.

20145525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20145525 is a deficient number, since it is larger than the sum of its proper divisors (13161867).

20145525 is a wasteful number, since it uses less digits than its factorization.

20145525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268620 (or 268615 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 20145525 is about 4488.3766553176. The cubic root of 20145525 is about 272.0985306601.

Adding to 20145525 its reverse (52554102), we get a palindrome (72699627).

The spelling of 20145525 in words is "twenty million, one hundred forty-five thousand, five hundred twenty-five".