20666222 has 4 divisors (see below), whose sum is σ = 30999336. Its totient is φ = 10333110.

The previous prime is 20666221. The next prime is 20666249. The reversal of 20666222 is 22266602.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20666191 and 20666200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20666221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5166554 + ... + 5166557.

It is an arithmetic number, because the mean of its divisors is an integer number (7749834).

Almost surely, 2^20666222 is an apocalyptic number.

20666222 is a deficient number, since it is larger than the sum of its proper divisors (10333114).

20666222 is a wasteful number, since it uses less digits than its factorization.

20666222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10333113.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20666222 is about 4546.0116585860. The cubic root of 20666222 is about 274.4229088218.

The spelling of 20666222 in words is "twenty million, six hundred sixty-six thousand, two hundred twenty-two".