1213244020 has 48 divisors (see below), whose sum is σ = 2663216640. Its totient is φ = 463389696.

The previous prime is 1213244009. The next prime is 1213244093. The reversal of 1213244020 is 204423121.

It is a super-2 number, since 2×1213244020² = 2943922104131520800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307621 + ... + 311539.

It is an arithmetic number, because the mean of its divisors is an integer number (55483680).

Almost surely, 2^1213244020 is an apocalyptic number.

1213244020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213244020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1331608320).

1213244020 is an abundant number, since it is smaller than the sum of its proper divisors (1449972620).

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

1213244020 is a wasteful number, since it uses less digits than its factorization.

1213244020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624 (or 4622 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1213244020 is about 34831.6525591308. The cubic root of 1213244020 is about 1066.5536831285.

Adding to 1213244020 its reverse (204423121), we get a palindrome (1417667141).

The spelling of 1213244020 in words is "one billion, two hundred thirteen million, two hundred forty-four thousand, twenty".