20910128 has 20 divisors (see below), whose sum is σ = 42275568. Its totient is φ = 10000320.

The previous prime is 20910121. The next prime is 20910137. The reversal of 20910128 is 82101902.

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

It is not an unprimeable number, because it can be changed into a prime (20910121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28043 + ... + 28778.

Almost surely, 2^20910128 is an apocalyptic number.

It is an amenable number.

20910128 is an abundant number, since it is smaller than the sum of its proper divisors (21365440).

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

20910128 is a wasteful number, since it uses less digits than its factorization.

20910128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56852 (or 56846 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20910128 is about 4572.7593420166. The cubic root of 20910128 is about 275.4982833722.

The spelling of 20910128 in words is "twenty million, nine hundred ten thousand, one hundred twenty-eight".