1231603020 has 72 divisors (see below), whose sum is σ = 3739475376. Its totient is φ = 328109952.

The previous prime is 1231603019. The next prime is 1231603027. The reversal of 1231603020 is 203061321.

1231603020 is a `hidden beast` number, since 12 + 31 + 603 + 0 + 20 = 666.

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 = 1231602984 and 1231603002.

It is not an unprimeable number, because it can be changed into a prime (1231603027) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 228274 + ... + 233606.

It is an arithmetic number, because the mean of its divisors is an integer number (51937158).

Almost surely, 2^1231603020 is an apocalyptic number.

1231603020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231603020 is an abundant number, since it is smaller than the sum of its proper divisors (2507872356).

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

1231603020 is a wasteful number, since it uses less digits than its factorization.

1231603020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6631 (or 6626 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1231603020 is about 35094.2020852448. The cubic root of 1231603020 is about 1071.9065261094.

Adding to 1231603020 its reverse (203061321), we get a palindrome (1434664341).

The spelling of 1231603020 in words is "one billion, two hundred thirty-one million, six hundred three thousand, twenty".