20669188 has 36 divisors (see below), whose sum is σ = 39481680. Its totient is φ = 9441360.

The previous prime is 20669183. The next prime is 20669189. The reversal of 20669188 is 88196602.

It is a self number, because there is not a number n which added to its sum of digits gives 20669188.

It is not an unprimeable number, because it can be changed into a prime (20669183) 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 11 ways as a sum of consecutive naturals, for example, 72895 + ... + 73177.

Almost surely, 2^20669188 is an apocalyptic number.

It is an amenable number.

20669188 is a deficient number, since it is larger than the sum of its proper divisors (18812492).

20669188 is a wasteful number, since it uses less digits than its factorization.

20669188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 20669188 is about 4546.3378668990. The cubic root of 20669188 is about 274.4360365142.

The spelling of 20669188 in words is "twenty million, six hundred sixty-nine thousand, one hundred eighty-eight".