20905084 has 6 divisors (see below), whose sum is σ = 36583904. Its totient is φ = 10452540.

The previous prime is 20905069. The next prime is 20905097. The reversal of 20905084 is 48050902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2613132 + ... + 2613139.

Almost surely, 2^20905084 is an apocalyptic number.

It is an amenable number.

20905084 is a deficient number, since it is larger than the sum of its proper divisors (15678820).

20905084 is a wasteful number, since it uses less digits than its factorization.

20905084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226275 (or 5226273 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20905084 is about 4572.2077818052. The cubic root of 20905084 is about 275.4761294333.

Adding to 20905084 its reverse (48050902), we get a palindrome (68955986).

The spelling of 20905084 in words is "twenty million, nine hundred five thousand, eighty-four".