20699128 has 16 divisors (see below), whose sum is σ = 38876760. Its totient is φ = 10332000.

The previous prime is 20699123. The next prime is 20699131. The reversal of 20699128 is 82199602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20699123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3763 + ... + 7453.

Almost surely, 2^20699128 is an apocalyptic number.

It is an amenable number.

20699128 is a deficient number, since it is larger than the sum of its proper divisors (18177632).

20699128 is a wasteful number, since it uses less digits than its factorization.

20699128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4398 (or 4394 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 20699128 is about 4549.6294354596. The cubic root of 20699128 is about 274.5684824651.

The spelling of 20699128 in words is "twenty million, six hundred ninety-nine thousand, one hundred twenty-eight".