20475205 has 8 divisors (see below), whose sum is σ = 24601752. Its totient is φ = 16359168.

The previous prime is 20475197. The next prime is 20475253. The reversal of 20475205 is 50257402.

It can be written as a sum of positive squares in 4 ways, for example, as 1760929 + 18714276 = 1327^2 + 4326^2 .

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 20475205 - 2³ = 20475197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20475205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2617 + ... + 6913.

It is an arithmetic number, because the mean of its divisors is an integer number (3075219).

Almost surely, 2^20475205 is an apocalyptic number.

It is an amenable number.

20475205 is a deficient number, since it is larger than the sum of its proper divisors (4126547).

20475205 is an equidigital number, since it uses as much as digits as its factorization.

20475205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20475205 is about 4524.9535909222. The cubic root of 20475205 is about 273.5747973676.

The spelling of 20475205 in words is "twenty million, four hundred seventy-five thousand, two hundred five".