20943128 has 32 divisors (see below), whose sum is σ = 40869360. Its totient is φ = 10053120.

The previous prime is 20943127. The next prime is 20943157. The reversal of 20943128 is 82134902.

It is a super-2 number, since 2×20943128² = 877229220848768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20943128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20943127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21500 + ... + 22452.

Almost surely, 2^20943128 is an apocalyptic number.

It is an amenable number.

20943128 is a deficient number, since it is larger than the sum of its proper divisors (19926232).

20943128 is a wasteful number, since it uses less digits than its factorization.

20943128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067 (or 1063 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20943128 is about 4576.3662440849. The cubic root of 20943128 is about 275.6431360625.

The spelling of 20943128 in words is "twenty million, nine hundred forty-three thousand, one hundred twenty-eight".