20031660636 has 24 divisors (see below), whose sum is σ = 50335968144. Its totient is φ = 6163587840.

The previous prime is 20031660611. The next prime is 20031660653. The reversal of 20031660636 is 63606613002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20031660597 and 20031660606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64203885 + ... + 64204196.

It is an arithmetic number, because the mean of its divisors is an integer number (2097332006).

Almost surely, 2^20031660636 is an apocalyptic number.

20031660636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20031660636 is an abundant number, since it is smaller than the sum of its proper divisors (30304307508).

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

20031660636 is a wasteful number, since it uses less digits than its factorization.

20031660636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128408101 (or 128408099 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The spelling of 20031660636 in words is "twenty billion, thirty-one million, six hundred sixty thousand, six hundred thirty-six".