20505896 has 8 divisors (see below), whose sum is σ = 38448570. Its totient is φ = 10252944.

The previous prime is 20505887. The next prime is 20505917. The reversal of 20505896 is 69850502.

It can be written as a sum of positive squares in only one way, i.e., 10329796 + 10176100 = 3214^2 + 3190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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, 1281611 + ... + 1281626.

Almost surely, 2^20505896 is an apocalyptic number.

It is an amenable number.

20505896 is a deficient number, since it is larger than the sum of its proper divisors (17942674).

20505896 is a wasteful number, since it uses less digits than its factorization.

20505896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563243 (or 2563239 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 20505896 is about 4528.3436265372. The cubic root of 20505896 is about 273.7114194012.

The spelling of 20505896 in words is "twenty million, five hundred five thousand, eight hundred ninety-six".