1244680020 has 84 divisors (see below), whose sum is σ = 3918995220. Its totient is φ = 331910784.

The previous prime is 1244680013. The next prime is 1244680043. The reversal of 1244680020 is 200864421.

It can be written as a sum of positive squares in 2 ways, for example, as 148937616 + 1095742404 = 12204^2 + 33102^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 28105 + ... + 57264.

It is an arithmetic number, because the mean of its divisors is an integer number (46654705).

Almost surely, 2^1244680020 is an apocalyptic number.

1244680020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244680020 is an abundant number, since it is smaller than the sum of its proper divisors (2674315200).

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

1244680020 is an equidigital number, since it uses as much as digits as its factorization.

1244680020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85396 (or 85379 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 1244680020 is about 35280.0229591762. The cubic root of 1244680020 is about 1075.6869652727.

The spelling of 1244680020 in words is "one billion, two hundred forty-four million, six hundred eighty thousand, twenty".