20001031200 has 108 divisors (see below), whose sum is σ = 70528661658. Its totient is φ = 5333606400.

The previous prime is 20001031159. The next prime is 20001031201. The reversal of 20001031200 is 213010002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 19219940496 + 781090704 = 138636^2 + 27948^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20001031201) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 1381761 + ... + 1396160.

Almost surely, 2^20001031200 is an apocalyptic number.

20001031200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001031200 is an abundant number, since it is smaller than the sum of its proper divisors (50527630458).

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

20001031200 is a wasteful number, since it uses less digits than its factorization.

20001031200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777947 (or 2777931 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 20001031200 its reverse (213010002), we get a palindrome (20214041202).

The spelling of 20001031200 in words is "twenty billion, one million, thirty-one thousand, two hundred".