20485485 has 12 divisors (see below), whose sum is σ = 35508252. Its totient is φ = 10925568.

The previous prime is 20485483. The next prime is 20485499. The reversal of 20485485 is 58458402.

It can be written as a sum of positive squares in 2 ways, for example, as 15163236 + 5322249 = 3894^2 + 2307^2 .

It is not a de Polignac number, because 20485485 - 2¹ = 20485483 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20485483) 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 11 ways as a sum of consecutive naturals, for example, 227572 + ... + 227661.

It is an arithmetic number, because the mean of its divisors is an integer number (2959021).

Almost surely, 2^20485485 is an apocalyptic number.

It is an amenable number.

20485485 is a deficient number, since it is larger than the sum of its proper divisors (15022767).

20485485 is a wasteful number, since it uses less digits than its factorization.

20485485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455244 (or 455241 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

The square root of 20485485 is about 4526.0893716320. The cubic root of 20485485 is about 273.6205743351.

The spelling of 20485485 in words is "twenty million, four hundred eighty-five thousand, four hundred eighty-five".