20485279 has 4 divisors (see below), whose sum is σ = 20921184. Its totient is φ = 20049376.

The previous prime is 20485277. The next prime is 20485301. The reversal of 20485279 is 97258402.

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

It is a cyclic number.

It is not a de Polignac number, because 20485279 - 2¹ = 20485277 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 (20485271) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 217882 + ... + 217975.

It is an arithmetic number, because the mean of its divisors is an integer number (5230296).

Almost surely, 2^20485279 is an apocalyptic number.

20485279 is a deficient number, since it is larger than the sum of its proper divisors (435905).

20485279 is an equidigital number, since it uses as much as digits as its factorization.

20485279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435904.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 20485279 is about 4526.0666146225. The cubic root of 20485279 is about 273.6196571650.

The spelling of 20485279 in words is "twenty million, four hundred eighty-five thousand, two hundred seventy-nine".