20707128 has 48 divisors (see below), whose sum is σ = 60398520. Its totient is φ = 6371136.

The previous prime is 20707117. The next prime is 20707133. The reversal of 20707128 is 82170702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10126 + ... + 11997.

Almost surely, 2^20707128 is an apocalyptic number.

It is an amenable number.

20707128 is an abundant number, since it is smaller than the sum of its proper divisors (39691392).

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

20707128 is a wasteful number, since it uses less digits than its factorization.

20707128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22148 (or 22141 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 20707128 is about 4550.5085430092. The cubic root of 20707128 is about 274.6038505401.

The spelling of 20707128 in words is "twenty million, seven hundred seven thousand, one hundred twenty-eight".