20630222 has 4 divisors (see below), whose sum is σ = 30945336. Its totient is φ = 10315110.

The previous prime is 20630213. The next prime is 20630243. The reversal of 20630222 is 22203602.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20630222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5157554 + ... + 5157557.

It is an arithmetic number, because the mean of its divisors is an integer number (7736334).

Almost surely, 2^20630222 is an apocalyptic number.

20630222 is a deficient number, since it is larger than the sum of its proper divisors (10315114).

20630222 is a wasteful number, since it uses less digits than its factorization.

20630222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10315113.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20630222 is about 4542.0504180381. The cubic root of 20630222 is about 274.2634704442.

Adding to 20630222 its reverse (22203602), we get a palindrome (42833824).

The spelling of 20630222 in words is "twenty million, six hundred thirty thousand, two hundred twenty-two".