20128601 has 4 divisors (see below), whose sum is σ = 20596752. Its totient is φ = 19660452.

The previous prime is 20128583. The next prime is 20128607. The reversal of 20128601 is 10682102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10682102 = 2 ⋅5341051.

It is a cyclic number.

It is not a de Polignac number, because 20128601 - 2¹⁴ = 20112217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20128607) 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, 234011 + ... + 234096.

It is an arithmetic number, because the mean of its divisors is an integer number (5149188).

Almost surely, 2^20128601 is an apocalyptic number.

It is an amenable number.

20128601 is a deficient number, since it is larger than the sum of its proper divisors (468151).

20128601 is an equidigital number, since it uses as much as digits as its factorization.

20128601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468150.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 20128601 is about 4486.4909450483. The cubic root of 20128601 is about 272.0223138052.

The spelling of 20128601 in words is "twenty million, one hundred twenty-eight thousand, six hundred one".