20000128 has 64 divisors (see below), whose sum is σ = 42325920. Its totient is φ = 9400320.

The previous prime is 20000107. The next prime is 20000147. The reversal of 20000128 is 82100002.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194125 + ... + 194227.

Almost surely, 2^20000128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20000128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21162960).

20000128 is an abundant number, since it is smaller than the sum of its proper divisors (22325792).

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

20000128 is a wasteful number, since it uses less digits than its factorization.

20000128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 20000128 is about 4472.1502658117. The cubic root of 20000128 is about 271.4423407340.

It can be divided in two parts, 20000 and 128, that multiplied together give a 4-th power (2560000 = 40⁴).

The spelling of 20000128 in words is "twenty million, one hundred twenty-eight", and thus it is an aban number.