1247266020 has 384 divisors, whose sum is σ = 4940328960. Its totient is φ = 226437120.

The previous prime is 1247266019. The next prime is 1247266049. The reversal of 1247266020 is 206627421.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1140594 + ... + 1141686.

It is an arithmetic number, because the mean of its divisors is an integer number (12865440).

Almost surely, 2^1247266020 is an apocalyptic number.

1247266020 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 1247266020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2470164480).

1247266020 is an abundant number, since it is smaller than the sum of its proper divisors (3693062940).

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

1247266020 is a wasteful number, since it uses less digits than its factorization.

1247266020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 1247266020 is about 35316.6535787297. The cubic root of 1247266020 is about 1076.4314142315.

The spelling of 1247266020 in words is "one billion, two hundred forty-seven million, two hundred sixty-six thousand, twenty".