20724307 has 8 divisors (see below), whose sum is σ = 22092800. Its totient is φ = 19383624.

The previous prime is 20724287. The next prime is 20724349. The reversal of 20724307 is 70342702.

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 20724307 - 2²³ = 12335699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20724367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5403 + ... + 8404.

It is an arithmetic number, because the mean of its divisors is an integer number (2761600).

Almost surely, 2^20724307 is an apocalyptic number.

20724307 is a deficient number, since it is larger than the sum of its proper divisors (1368493).

20724307 is a wasteful number, since it uses less digits than its factorization.

20724307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13905.

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 20724307 is about 4552.3957429029. The cubic root of 20724307 is about 274.6797682885.

The spelling of 20724307 in words is "twenty million, seven hundred twenty-four thousand, three hundred seven".