20722105 has 8 divisors (see below), whose sum is σ = 25668864. Its totient is φ = 16042800.

The previous prime is 20722073. The next prime is 20722123. The reversal of 20722105 is 50122702.

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

It is not a de Polignac number, because 20722105 - 2⁵ = 20722073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 66691 + ... + 67000.

It is an arithmetic number, because the mean of its divisors is an integer number (3208608).

Almost surely, 2^20722105 is an apocalyptic number.

It is an amenable number.

20722105 is a deficient number, since it is larger than the sum of its proper divisors (4946759).

20722105 is a wasteful number, since it uses less digits than its factorization.

20722105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133727.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20722105 is about 4552.1538857996. The cubic root of 20722105 is about 274.6700395149.

Adding to 20722105 its reverse (50122702), we get a palindrome (70844807).

The spelling of 20722105 in words is "twenty million, seven hundred twenty-two thousand, one hundred five".