20475461 has 4 divisors (see below), whose sum is σ = 20526924. Its totient is φ = 20424000.

The previous prime is 20475383. The next prime is 20475491. The reversal of 20475461 is 16457402.

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 10432900 + 10042561 = 3230^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 20475461 - 2¹⁸ = 20213317 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 (20475491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25130 + ... + 25931.

It is an arithmetic number, because the mean of its divisors is an integer number (5131731).

Almost surely, 2^20475461 is an apocalyptic number.

It is an amenable number.

20475461 is a deficient number, since it is larger than the sum of its proper divisors (51463).

20475461 is an equidigital number, since it uses as much as digits as its factorization.

20475461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51462.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20475461 is about 4524.9818784168. The cubic root of 20475461 is about 273.5759375248.

The spelling of 20475461 in words is "twenty million, four hundred seventy-five thousand, four hundred sixty-one".