20724079 has 8 divisors (see below), whose sum is σ = 22173680. Its totient is φ = 19310400.

The previous prime is 20724049. The next prime is 20724091. The reversal of 20724079 is 97042702.

It is a happy number.

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 20724079 - 2⁵ = 20724047 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 20724079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724019) 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, 7782 + ... + 10099.

It is an arithmetic number, because the mean of its divisors is an integer number (2771710).

Almost surely, 2^20724079 is an apocalyptic number.

20724079 is a deficient number, since it is larger than the sum of its proper divisors (1449601).

20724079 is a wasteful number, since it uses less digits than its factorization.

20724079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17961.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 20724079 is about 4552.3707010743. The cubic root of 20724079 is about 274.6787609815.

The spelling of 20724079 in words is "twenty million, seven hundred twenty-four thousand, seventy-nine".