20145604 has 12 divisors (see below), whose sum is σ = 36470700. Its totient is φ = 9725408.

The previous prime is 20145589. The next prime is 20145607. The reversal of 20145604 is 40654102.

It can be written as a sum of positive squares in 2 ways, for example, as 15984004 + 4161600 = 3998^2 + 2040^2 .

It is not an unprimeable number, because it can be changed into a prime (20145607) 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, 86719 + ... + 86950.

It is an arithmetic number, because the mean of its divisors is an integer number (3039225).

Almost surely, 2^20145604 is an apocalyptic number.

It is an amenable number.

20145604 is a deficient number, since it is larger than the sum of its proper divisors (16325096).

20145604 is a wasteful number, since it uses less digits than its factorization.

20145604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173702 (or 173700 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20145604 is about 4488.3854558182. The cubic root of 20145604 is about 272.0988863348.

Adding to 20145604 its reverse (40654102), we get a palindrome (60799706).

The spelling of 20145604 in words is "twenty million, one hundred forty-five thousand, six hundred four".