20475305 has 8 divisors (see below), whose sum is σ = 25417800. Its totient is φ = 15815296.

The previous prime is 20475289. The next prime is 20475311. The reversal of 20475305 is 50357402.

It can be written as a sum of positive squares in 4 ways, for example, as 619369 + 19855936 = 787^2 + 4456^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20475305 - 2⁴ = 20475289 is a prime.

It is a super-2 number, since 2×20475305² = 838476229686050, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 70460 + ... + 70749.

It is an arithmetic number, because the mean of its divisors is an integer number (3177225).

Almost surely, 2^20475305 is an apocalyptic number.

It is an amenable number.

20475305 is a deficient number, since it is larger than the sum of its proper divisors (4942495).

20475305 is a wasteful number, since it uses less digits than its factorization.

20475305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141243.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20475305 is about 4524.9646407458. The cubic root of 20475305 is about 273.5752427426.

The spelling of 20475305 in words is "twenty million, four hundred seventy-five thousand, three hundred five".