20720479 has 8 divisors (see below), whose sum is σ = 22383200. Its totient is φ = 19067616.

The previous prime is 20720459. The next prime is 20720519. The reversal of 20720479 is 97402702.

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 20720479 - 2⁹ = 20719967 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 20720479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720429) 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, 2254 + ... + 6820.

It is an arithmetic number, because the mean of its divisors is an integer number (2797900).

Almost surely, 2^20720479 is an apocalyptic number.

20720479 is a deficient number, since it is larger than the sum of its proper divisors (1662721).

20720479 is a wasteful number, since it uses less digits than its factorization.

20720479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4929.

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

The square root of 20720479 is about 4551.9752855217. The cubic root of 20720479 is about 274.6628551552.

The spelling of 20720479 in words is "twenty million, seven hundred twenty thousand, four hundred seventy-nine".