20071279 has 4 divisors (see below), whose sum is σ = 20613784. Its totient is φ = 19528776.

The previous prime is 20071273. The next prime is 20071297. The reversal of 20071279 is 97217002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97217002 = 2 ⋅48608501.

It is a cyclic number.

It is not a de Polignac number, because 20071279 - 2⁹ = 20070767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20071273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271197 + ... + 271270.

It is an arithmetic number, because the mean of its divisors is an integer number (5153446).

Almost surely, 2^20071279 is an apocalyptic number.

20071279 is a deficient number, since it is larger than the sum of its proper divisors (542505).

20071279 is an equidigital number, since it uses as much as digits as its factorization.

20071279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542504.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20071279 is about 4480.0981016045. The cubic root of 20071279 is about 271.7638476181.

The spelling of 20071279 in words is "twenty million, seventy-one thousand, two hundred seventy-nine".