20724043 has 8 divisors (see below), whose sum is σ = 21098288. Its totient is φ = 20352384.

The previous prime is 20724019. The next prime is 20724047. The reversal of 20724043 is 34042702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20724043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20724047) 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, 22396 + ... + 23302.

It is an arithmetic number, because the mean of its divisors is an integer number (2637286).

Almost surely, 2^20724043 is an apocalyptic number.

20724043 is a deficient number, since it is larger than the sum of its proper divisors (374245).

20724043 is an equidigital number, since it uses as much as digits as its factorization.

20724043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293.

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 20724043 is about 4552.3667470888. The cubic root of 20724043 is about 274.6786019324.

Adding to 20724043 its reverse (34042702), we get a palindrome (54766745).

The spelling of 20724043 in words is "twenty million, seven hundred twenty-four thousand, forty-three".