20505796 has 6 divisors (see below), whose sum is σ = 35885150. Its totient is φ = 10252896.

The previous prime is 20505761. The next prime is 20505799. The reversal of 20505796 is 69750502.

It can be written as a sum of positive squares in only one way, i.e., 20376196 + 129600 = 4514^2 + 360^2 .

It is not an unprimeable number, because it can be changed into a prime (20505799) by changing a digit.

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, 2563221 + ... + 2563228.

Almost surely, 2^20505796 is an apocalyptic number.

It is an amenable number.

20505796 is a deficient number, since it is larger than the sum of its proper divisors (15379354).

20505796 is a wasteful number, since it uses less digits than its factorization.

20505796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5126453 (or 5126451 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 20505796 is about 4528.3325849588. The cubic root of 20505796 is about 273.7109744692.

The spelling of 20505796 in words is "twenty million, five hundred five thousand, seven hundred ninety-six".