20128497 has 8 divisors (see below), whose sum is σ = 26943456. Its totient is φ = 13366272.

The previous prime is 20128487. The next prime is 20128501. The reversal of 20128497 is 79482102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20128497 - 2⁷ = 20128369 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20128447) 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, 12283 + ... + 13824.

It is an arithmetic number, because the mean of its divisors is an integer number (3367932).

Almost surely, 2^20128497 is an apocalyptic number.

It is an amenable number.

20128497 is a deficient number, since it is larger than the sum of its proper divisors (6814959).

20128497 is a wasteful number, since it uses less digits than its factorization.

20128497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26367.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20128497 is about 4486.4793546834. The cubic root of 20128497 is about 272.0218453115.

The spelling of 20128497 in words is "twenty million, one hundred twenty-eight thousand, four hundred ninety-seven".