22720747 has 8 divisors (see below), whose sum is σ = 26028000. Its totient is φ = 19428864.

The previous prime is 22720741. The next prime is 22720759. The reversal of 22720747 is 74702722.

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

It is a de Polignac number, because none of the positive numbers 2^k-22720747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22720741) 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, 472 + ... + 6757.

It is an arithmetic number, because the mean of its divisors is an integer number (3253500).

Almost surely, 2^22720747 is an apocalyptic number.

22720747 is a deficient number, since it is larger than the sum of its proper divisors (3307253).

22720747 is an equidigital number, since it uses as much as digits as its factorization.

22720747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7685.

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 22720747 is about 4766.6284730405. The cubic root of 22720747 is about 283.2310540481.

The spelling of 22720747 in words is "twenty-two million, seven hundred twenty thousand, seven hundred forty-seven".