20420279 has 8 divisors (see below), whose sum is σ = 22343040. Its totient is φ = 18508600.

The previous prime is 20420243. The next prime is 20420287. The reversal of 20420279 is 97202402.

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

It is not a de Polignac number, because 20420279 - 2²⁴ = 3643063 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 (20420209) 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, 1364 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (2792880).

Almost surely, 2^20420279 is an apocalyptic number.

20420279 is a deficient number, since it is larger than the sum of its proper divisors (1922761).

20420279 is a wasteful number, since it uses less digits than its factorization.

20420279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5541.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20420279 is about 4518.8802816627. The cubic root of 20420279 is about 273.3299512107.

The spelling of 20420279 in words is "twenty million, four hundred twenty thousand, two hundred seventy-nine".