20522545 has 4 divisors (see below), whose sum is σ = 24627060. Its totient is φ = 16418032.

The previous prime is 20522543. The next prime is 20522549. The reversal of 20522545 is 54522502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4809249 + 15713296 = 2193^2 + 3964^2 .

It is a cyclic number.

It is not a de Polignac number, because 20522545 - 2¹ = 20522543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20522543) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2052250 + ... + 2052259.

It is an arithmetic number, because the mean of its divisors is an integer number (6156765).

Almost surely, 2^20522545 is an apocalyptic number.

It is an amenable number.

20522545 is a deficient number, since it is larger than the sum of its proper divisors (4104515).

20522545 is an equidigital number, since it uses as much as digits as its factorization.

20522545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104514.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 20522545 is about 4530.1815636904. The cubic root of 20522545 is about 273.7854759664.

The spelling of 20522545 in words is "twenty million, five hundred twenty-two thousand, five hundred forty-five".