20485605 has 32 divisors (see below), whose sum is σ = 38479104. Its totient is φ = 9110016.

The previous prime is 20485601. The next prime is 20485607. The reversal of 20485605 is 50658402.

It is not a de Polignac number, because 20485605 - 2² = 20485601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20485601) 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 31 ways as a sum of consecutive naturals, for example, 1249 + ... + 6521.

It is an arithmetic number, because the mean of its divisors is an integer number (1202472).

Almost surely, 2^20485605 is an apocalyptic number.

It is an amenable number.

20485605 is a deficient number, since it is larger than the sum of its proper divisors (17993499).

20485605 is a wasteful number, since it uses less digits than its factorization.

20485605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5325.

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

The square root of 20485605 is about 4526.1026280896. The cubic root of 20485605 is about 273.6211086062.

The spelling of 20485605 in words is "twenty million, four hundred eighty-five thousand, six hundred five".