20615222 has 8 divisors (see below), whose sum is σ = 32267376. Its totient is φ = 9859432.

The previous prime is 20615213. The next prime is 20615233. The reversal of 20615222 is 22251602.

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 = 20615194 and 20615203.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 224033 + ... + 224124.

It is an arithmetic number, because the mean of its divisors is an integer number (4033422).

Almost surely, 2^20615222 is an apocalyptic number.

20615222 is a deficient number, since it is larger than the sum of its proper divisors (11652154).

20615222 is a wasteful number, since it uses less digits than its factorization.

20615222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448182.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20615222 is about 4540.3988811557. The cubic root of 20615222 is about 274.1969830432.

Adding to 20615222 its reverse (22251602), we get a palindrome (42866824).

The spelling of 20615222 in words is "twenty million, six hundred fifteen thousand, two hundred twenty-two".