1231040020 has 96 divisors (see below), whose sum is σ = 3119800320. Its totient is φ = 398597760.

The previous prime is 1231039973. The next prime is 1231040051. The reversal of 1231040020 is 200401321.

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 31 ways as a sum of consecutive naturals, for example, 1241725 + ... + 1242715.

It is an arithmetic number, because the mean of its divisors is an integer number (32497920).

Almost surely, 2^1231040020 is an apocalyptic number.

1231040020 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 1231040020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1559900160).

1231040020 is an abundant number, since it is smaller than the sum of its proper divisors (1888760300).

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

1231040020 is a wasteful number, since it uses less digits than its factorization.

1231040020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1491 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1231040020 is about 35086.1799003539. The cubic root of 1231040020 is about 1071.7431684516.

Adding to 1231040020 its reverse (200401321), we get a palindrome (1431441341).

The spelling of 1231040020 in words is "one billion, two hundred thirty-one million, forty thousand, twenty".