20603808 has 60 divisors (see below), whose sum is σ = 60602850. Its totient is φ = 6867072.

The previous prime is 20603801. The next prime is 20603827. The reversal of 20603808 is 80830602.

It can be written as a sum of positive squares in only one way, i.e., 17740944 + 2862864 = 4212^2 + 1692^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20603801) 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 9 ways as a sum of consecutive naturals, for example, 1383 + ... + 6566.

Almost surely, 2^20603808 is an apocalyptic number.

It is an amenable number.

20603808 is an abundant number, since it is smaller than the sum of its proper divisors (39999042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20603808 is an equidigital number, since it uses as much as digits as its factorization.

20603808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7971 (or 7954 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20603808 is about 4539.1417691013. The cubic root of 20603808 is about 274.1463689525.

The spelling of 20603808 in words is "twenty million, six hundred three thousand, eight hundred eight".