20722747 has 8 divisors (see below), whose sum is σ = 21991680. Its totient is φ = 19484520.

The previous prime is 20722687. The next prime is 20722769. The reversal of 20722747 is 74722702.

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 20722747 - 2⁷ = 20722619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20722447) 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, 6279 + ... + 8992.

It is an arithmetic number, because the mean of its divisors is an integer number (2748960).

Almost surely, 2^20722747 is an apocalyptic number.

20722747 is a deficient number, since it is larger than the sum of its proper divisors (1268933).

20722747 is a wasteful number, since it uses less digits than its factorization.

20722747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15353.

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

The square root of 20722747 is about 4552.2244013229. The cubic root of 20722747 is about 274.6728760405.

The spelling of 20722747 in words is "twenty million, seven hundred twenty-two thousand, seven hundred forty-seven".