20908084 has 6 divisors (see below), whose sum is σ = 36589154. Its totient is φ = 10454040.

The previous prime is 20908021. The next prime is 20908099. The reversal of 20908084 is 48080902.

It can be written as a sum of positive squares in only one way, i.e., 20903184 + 4900 = 4572^2 + 70^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2613507 + ... + 2613514.

Almost surely, 2^20908084 is an apocalyptic number.

It is an amenable number.

20908084 is a deficient number, since it is larger than the sum of its proper divisors (15681070).

20908084 is a wasteful number, since it uses less digits than its factorization.

20908084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5227025 (or 5227023 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20908084 is about 4572.5358391160. The cubic root of 20908084 is about 275.4893062736.

Adding to 20908084 its reverse (48080902), we get a palindrome (68988986).

The spelling of 20908084 in words is "twenty million, nine hundred eight thousand, eighty-four".