20195128 has 16 divisors (see below), whose sum is σ = 37940760. Its totient is φ = 10077600.

The previous prime is 20195111. The next prime is 20195137. The reversal of 20195128 is 82159102.

It is a junction number, because it is equal to n+sod(n) for n = 20195096 and 20195105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2358 + ... + 6778.

Almost surely, 2^20195128 is an apocalyptic number.

It is an amenable number.

20195128 is a deficient number, since it is larger than the sum of its proper divisors (17745632).

20195128 is a wasteful number, since it uses less digits than its factorization.

20195128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4998 (or 4994 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 20195128 is about 4493.8989752775. The cubic root of 20195128 is about 272.3216710521.

The spelling of 20195128 in words is "twenty million, one hundred ninety-five thousand, one hundred twenty-eight".