1223312020 has 24 divisors (see below), whose sum is σ = 2935949184. Its totient is φ = 419421216.

The previous prime is 1223312011. The next prime is 1223312023. The reversal of 1223312020 is 202133221.

It is a junction number, because it is equal to n+sod(n) for n = 1223311985 and 1223312003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223312023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4368832 + ... + 4369111.

It is an arithmetic number, because the mean of its divisors is an integer number (122331216).

Almost surely, 2^1223312020 is an apocalyptic number.

1223312020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223312020 is an abundant number, since it is smaller than the sum of its proper divisors (1712637164).

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

1223312020 is a wasteful number, since it uses less digits than its factorization.

1223312020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8737959 (or 8737957 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1223312020 is about 34975.8776873433. The cubic root of 1223312020 is about 1069.4957941219.

Adding to 1223312020 its reverse (202133221), we get a palindrome (1425445241).

The spelling of 1223312020 in words is "one billion, two hundred twenty-three million, three hundred twelve thousand, twenty".