20712128 has 28 divisors (see below), whose sum is σ = 43266360. Its totient is φ = 9810432.

The previous prime is 20712113. The next prime is 20712143. The reversal of 20712128 is 82121702.

It is an interprime number because it is at equal distance from previous prime (20712113) and next prime (20712143).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7301 + ... + 9732.

Almost surely, 2^20712128 is an apocalyptic number.

It is an amenable number.

20712128 is an abundant number, since it is smaller than the sum of its proper divisors (22554232).

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

20712128 is a wasteful number, since it uses less digits than its factorization.

20712128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17064 (or 17054 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20712128 is about 4551.0578989945. The cubic root of 20712128 is about 274.6259509614.

The spelling of 20712128 in words is "twenty million, seven hundred twelve thousand, one hundred twenty-eight".