20475291 has 4 divisors (see below), whose sum is σ = 27300392. Its totient is φ = 13650192.

The previous prime is 20475289. The next prime is 20475311. The reversal of 20475291 is 19257402.

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

It is not a de Polignac number, because 20475291 - 2¹ = 20475289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20475281) 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, 3412546 + ... + 3412551.

It is an arithmetic number, because the mean of its divisors is an integer number (6825098).

Almost surely, 2^20475291 is an apocalyptic number.

20475291 is a deficient number, since it is larger than the sum of its proper divisors (6825101).

20475291 is an equidigital number, since it uses as much as digits as its factorization.

20475291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6825100.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20475291 is about 4524.9630937721. The cubic root of 20475291 is about 273.5751803902.

The spelling of 20475291 in words is "twenty million, four hundred seventy-five thousand, two hundred ninety-one".