20506485 has 16 divisors (see below), whose sum is σ = 33574464. Its totient is φ = 10682112.

The previous prime is 20506459. The next prime is 20506487. The reversal of 20506485 is 58460502.

It is not a de Polignac number, because 20506485 - 2¹¹ = 20504437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15252 + ... + 16541.

It is an arithmetic number, because the mean of its divisors is an integer number (2098404).

Almost surely, 2^20506485 is an apocalyptic number.

It is an amenable number.

20506485 is a deficient number, since it is larger than the sum of its proper divisors (13067979).

20506485 is a wasteful number, since it uses less digits than its factorization.

20506485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31844.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 20506485 is about 4528.4086608874. The cubic root of 20506485 is about 273.7140400212.

Adding to 20506485 its reverse (58460502), we get a palindrome (78966987).

The spelling of 20506485 in words is "twenty million, five hundred six thousand, four hundred eighty-five".