20905622 has 8 divisors (see below), whose sum is σ = 31413096. Its totient is φ = 10434592.

The previous prime is 20905609. The next prime is 20905627. The reversal of 20905622 is 22650902.

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

It is a junction number, because it is equal to n+sod(n) for n = 20905591 and 20905600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20905627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7628 + ... + 9999.

It is an arithmetic number, because the mean of its divisors is an integer number (3926637).

Almost surely, 2^20905622 is an apocalyptic number.

20905622 is a deficient number, since it is larger than the sum of its proper divisors (10507474).

20905622 is a wasteful number, since it uses less digits than its factorization.

20905622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18222.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20905622 is about 4572.2666151483. The cubic root of 20905622 is about 275.4784925728.

The spelling of 20905622 in words is "twenty million, nine hundred five thousand, six hundred twenty-two".