20724647 has 8 divisors (see below), whose sum is σ = 22131840. Its totient is φ = 19363680.

The previous prime is 20724637. The next prime is 20724653. The reversal of 20724647 is 74642702.

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 20724647 - 2¹² = 20720551 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 (20724617) 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, 10628 + ... + 12425.

It is an arithmetic number, because the mean of its divisors is an integer number (2766480).

Almost surely, 2^20724647 is an apocalyptic number.

20724647 is a deficient number, since it is larger than the sum of its proper divisors (1407193).

20724647 is a wasteful number, since it uses less digits than its factorization.

20724647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23113.

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 20724647 is about 4552.4330857246. The cubic root of 20724647 is about 274.6812703992.

The spelling of 20724647 in words is "twenty million, seven hundred twenty-four thousand, six hundred forty-seven".