20550222 has 48 divisors (see below), whose sum is σ = 55516032. Its totient is φ = 5337360.

The previous prime is 20550217. The next prime is 20550223. The reversal of 20550222 is 22205502.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20550195 and 20550204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6028 + ... + 8799.

It is an arithmetic number, because the mean of its divisors is an integer number (1156584).

Almost surely, 2^20550222 is an apocalyptic number.

20550222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20550222 is an abundant number, since it is smaller than the sum of its proper divisors (34965810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20550222 is a wasteful number, since it uses less digits than its factorization.

20550222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14853 (or 14850 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20550222 is about 4533.2352685472. The cubic root of 20550222 is about 273.9084976931.

Adding to 20550222 its reverse (22205502), we get a palindrome (42755724).

The spelling of 20550222 in words is "twenty million, five hundred fifty thousand, two hundred twenty-two".