20669536 has 24 divisors (see below), whose sum is σ = 41118840. Its totient is φ = 10226688.

The previous prime is 20669531. The next prime is 20669543. The reversal of 20669536 is 63596602.

It is a junction number, because it is equal to n+sod(n) for n = 20669495 and 20669504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669531) 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 3 ways as a sum of consecutive naturals, for example, 226 + ... + 6433.

It is an arithmetic number, because the mean of its divisors is an integer number (1713285).

Almost surely, 2^20669536 is an apocalyptic number.

It is an amenable number.

20669536 is a deficient number, since it is larger than the sum of its proper divisors (20449304).

20669536 is an equidigital number, since it uses as much as digits as its factorization.

20669536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6766 (or 6758 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 20669536 is about 4546.3761393004. The cubic root of 20669536 is about 274.4375767005.

The spelling of 20669536 in words is "twenty million, six hundred sixty-nine thousand, five hundred thirty-six".