20523575 has 12 divisors (see below), whose sum is σ = 26071248. Its totient is φ = 16017600.

The previous prime is 20523557. The next prime is 20523577. The reversal of 20523575 is 57532502.

It is not a de Polignac number, because 20523575 - 2¹⁸ = 20261431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523577) 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 11 ways as a sum of consecutive naturals, for example, 8987 + ... + 11036.

It is an arithmetic number, because the mean of its divisors is an integer number (2172604).

Almost surely, 2^20523575 is an apocalyptic number.

20523575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20523575 is a deficient number, since it is larger than the sum of its proper divisors (5547673).

20523575 is a wasteful number, since it uses less digits than its factorization.

20523575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20074 (or 20069 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 29.

The square root of 20523575 is about 4530.2952442418. The cubic root of 20523575 is about 273.7900562028.

The spelling of 20523575 in words is "twenty million, five hundred twenty-three thousand, five hundred seventy-five".