20730525 has 24 divisors (see below), whose sum is σ = 35009664.
Its totient is φ = 10819200.
The previous prime is 20730491. The next prime is 20730529. The reversal of 20730525 is 52503702.
It is not a de Polignac number, because 20730525 - 215 = 20697757 is a prime.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 20730495 and 20730504.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20730529) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 585 + ... + 6465.
It is an arithmetic number, because the mean of its divisors is an integer number (1458736).
Almost surely, 220730525 is an apocalyptic number.
20730525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
It is an amenable number.
20730525 is a deficient number, since it is larger than the sum of its proper divisors (14279139).
20730525 is a wasteful number, since it uses less digits than its factorization.
20730525 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5941 (or 5936 counting only the distinct ones).
The product of its (nonzero) digits is 2100, while the sum is 24.
The square root of 20730525 is about 4553.0786287961.
The cubic root of 20730525 is about 274.7072366459.
The spelling of 20730525 in words is "twenty million, seven hundred thirty thousand, five hundred twenty-five".