20713279 has 8 divisors (see below), whose sum is σ = 21528000. Its totient is φ = 19905312.

The previous prime is 20713261. The next prime is 20713289. The reversal of 20713279 is 97231702.

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

It is a cyclic number.

It is not a de Polignac number, because 20713279 - 2⁹ = 20712767 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20713279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20713219) 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, 5082 + ... + 8200.

It is an arithmetic number, because the mean of its divisors is an integer number (2691000).

Almost surely, 2^20713279 is an apocalyptic number.

20713279 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20713279 is a deficient number, since it is larger than the sum of its proper divisors (814721).

20713279 is a wasteful number, since it uses less digits than its factorization.

20713279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20713279 is about 4551.1843513530. The cubic root of 20713279 is about 274.6310379748.

The spelling of 20713279 in words is "twenty million, seven hundred thirteen thousand, two hundred seventy-nine".