20563137 has 24 divisors (see below), whose sum is σ = 35043840. Its totient is φ = 11370240.

The previous prime is 20563133. The next prime is 20563139. The reversal of 20563137 is 73136502.

It is a happy number.

20563137 is a `hidden beast` number, since 20 + 5 + 631 + 3 + 7 = 666.

It is not a de Polignac number, because 20563137 - 2² = 20563133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20563137.

It is not an unprimeable number, because it can be changed into a prime (20563133) 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 in 23 ways as a sum of consecutive naturals, for example, 3312 + ... + 7217.

It is an arithmetic number, because the mean of its divisors is an integer number (1460160).

Almost surely, 2^20563137 is an apocalyptic number.

It is an amenable number.

20563137 is a deficient number, since it is larger than the sum of its proper divisors (14480703).

20563137 is a wasteful number, since it uses less digits than its factorization.

20563137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10573 (or 10570 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 20563137 is about 4534.6595241539. The cubic root of 20563137 is about 273.9658658883.

Adding to 20563137 its reverse (73136502), we get a palindrome (93699639).

The spelling of 20563137 in words is "twenty million, five hundred sixty-three thousand, one hundred thirty-seven".