20128479 has 8 divisors (see below), whose sum is σ = 30672000. Its totient is φ = 11501976.

The previous prime is 20128477. The next prime is 20128483. The reversal of 20128479 is 97482102.

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 20128479 - 2¹ = 20128477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128477) 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, 479229 + ... + 479270.

It is an arithmetic number, because the mean of its divisors is an integer number (3834000).

Almost surely, 2^20128479 is an apocalyptic number.

20128479 is a deficient number, since it is larger than the sum of its proper divisors (10543521).

20128479 is an equidigital number, since it uses as much as digits as its factorization.

20128479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958509.

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

The square root of 20128479 is about 4486.4773486556. The cubic root of 20128479 is about 272.0217642259.

It can be divided in two parts, 201 and 28479, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 20128479 in words is "twenty million, one hundred twenty-eight thousand, four hundred seventy-nine".