20722449 has 8 divisors (see below), whose sum is σ = 30141792. Its totient is φ = 12559040.

The previous prime is 20722447. The next prime is 20722451. The reversal of 20722449 is 94422702.

It is an interprime number because it is at equal distance from previous prime (20722447) and next prime (20722451).

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 20722449 - 2¹ = 20722447 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313944 + ... + 314009.

It is an arithmetic number, because the mean of its divisors is an integer number (3767724).

Almost surely, 2^20722449 is an apocalyptic number.

It is an amenable number.

20722449 is a deficient number, since it is larger than the sum of its proper divisors (9419343).

20722449 is a wasteful number, since it uses less digits than its factorization.

20722449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627967.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20722449 is about 4552.1916699542. The cubic root of 20722449 is about 274.6715594050.

The spelling of 20722449 in words is "twenty million, seven hundred twenty-two thousand, four hundred forty-nine".