20703128 has 32 divisors (see below), whose sum is σ = 41614560. Its totient is φ = 9630720.

The previous prime is 20703121. The next prime is 20703131. The reversal of 20703128 is 82130702.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20703121) 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, 5288 + ... + 8328.

It is an arithmetic number, because the mean of its divisors is an integer number (1300455).

Almost surely, 2^20703128 is an apocalyptic number.

It is an amenable number.

20703128 is an abundant number, since it is smaller than the sum of its proper divisors (20911432).

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

20703128 is a wasteful number, since it uses less digits than its factorization.

20703128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107 (or 3103 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20703128 is about 4550.0690104657. The cubic root of 20703128 is about 274.5861676415.

The spelling of 20703128 in words is "twenty million, seven hundred three thousand, one hundred twenty-eight".