31203000020 has 12 divisors (see below), whose sum is σ = 65526300084. Its totient is φ = 12481200000.

The previous prime is 31203000007. The next prime is 31203000053. The reversal of 31203000020 is 2000030213.

It can be written as a sum of positive squares in 2 ways, for example, as 22877167504 + 8325832516 = 151252^2 + 91246^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31202999965 and 31203000010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780074981 + ... + 780075020.

It is an arithmetic number, because the mean of its divisors is an integer number (5460525007).

Almost surely, 2^31203000020 is an apocalyptic number.

It is an amenable number.

31203000020 is an abundant number, since it is smaller than the sum of its proper divisors (34323300064).

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

31203000020 is a wasteful number, since it uses less digits than its factorization.

31203000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560150010 (or 1560150008 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

Adding to 31203000020 its reverse (2000030213), we get a palindrome (33203030233).

The spelling of 31203000020 in words is "thirty-one billion, two hundred three million, twenty", and thus it is an aban number.