20120279 has 4 divisors (see below), whose sum is σ = 20362776. Its totient is φ = 19877784.

The previous prime is 20120263. The next prime is 20120281. The reversal of 20120279 is 97202102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20120279 - 2⁴ = 20120263 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 (20128279) 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, 121124 + ... + 121289.

It is an arithmetic number, because the mean of its divisors is an integer number (5090694).

Almost surely, 2^20120279 is an apocalyptic number.

20120279 is a deficient number, since it is larger than the sum of its proper divisors (242497).

20120279 is an equidigital number, since it uses as much as digits as its factorization.

20120279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242496.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 20120279 is about 4485.5633982812. The cubic root of 20120279 is about 271.9848201952.

The spelling of 20120279 in words is "twenty million, one hundred twenty thousand, two hundred seventy-nine".