20563496 has 8 divisors (see below), whose sum is σ = 38556570. Its totient is φ = 10281744.

The previous prime is 20563493. The next prime is 20563511. The reversal of 20563496 is 69436502.

It can be written as a sum of positive squares in only one way, i.e., 15319396 + 5244100 = 3914^2 + 2290^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20563493) 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, 1285211 + ... + 1285226.

Almost surely, 2^20563496 is an apocalyptic number.

It is an amenable number.

20563496 is a deficient number, since it is larger than the sum of its proper divisors (17993074).

20563496 is a wasteful number, since it uses less digits than its factorization.

20563496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570443 (or 2570439 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 20563496 is about 4534.6991079894. The cubic root of 20563496 is about 273.9674602166.

Adding to 20563496 its reverse (69436502), we get a palindrome (89999998).

The spelling of 20563496 in words is "twenty million, five hundred sixty-three thousand, four hundred ninety-six".