1223220220 has 24 divisors (see below), whose sum is σ = 2574910800. Its totient is φ = 488116992.

The previous prime is 1223220197. The next prime is 1223220233. The reversal of 1223220220 is 220223221.

It is a junction number, because it is equal to n+sod(n) for n = 1223220194 and 1223220203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64605 + ... + 81364.

It is an arithmetic number, because the mean of its divisors is an integer number (107287950).

Almost surely, 2^1223220220 is an apocalyptic number.

1223220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223220220 is an abundant number, since it is smaller than the sum of its proper divisors (1351690580).

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

1223220220 is a wasteful number, since it uses less digits than its factorization.

1223220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146397 (or 146395 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 1223220220 is about 34974.5653296792. The cubic root of 1223220220 is about 1069.4690410210.

Adding to 1223220220 its reverse (220223221), we get a palindrome (1443443441).

It can be divided in two parts, 1223220 and 220, that multiplied together give a triangular number (269108400 = T₂₃₁₉₉).

The spelling of 1223220220 in words is "one billion, two hundred twenty-three million, two hundred twenty thousand, two hundred twenty".