1273210020 has 72 divisors (see below), whose sum is σ = 3865767360. Its totient is φ = 339197760.

The previous prime is 1273209991. The next prime is 1273210039. The reversal of 1273210020 is 200123721.

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 = 1273209975 and 1273210002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229641 + ... + 235119.

Almost surely, 2^1273210020 is an apocalyptic number.

1273210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273210020 is an abundant number, since it is smaller than the sum of its proper divisors (2592557340).

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

1273210020 is a wasteful number, since it uses less digits than its factorization.

1273210020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6785 (or 6780 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1273210020 is about 35682.0686059539. The cubic root of 1273210020 is about 1083.8437625163.

Adding to 1273210020 its reverse (200123721), we get a palindrome (1473333741).

The spelling of 1273210020 in words is "one billion, two hundred seventy-three million, two hundred ten thousand, twenty".