20001031020 has 36 divisors (see below), whose sum is σ = 60669794640. Its totient is φ = 5333608224.

The previous prime is 20001031013. The next prime is 20001031031. The reversal of 20001031020 is 2013010002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 20001030993 and 20001031011.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55558240 + ... + 55558599.

Almost surely, 2^20001031020 is an apocalyptic number.

20001031020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001031020 is an abundant number, since it is smaller than the sum of its proper divisors (40668763620).

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

20001031020 is a wasteful number, since it uses less digits than its factorization.

20001031020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111116854 (or 111116849 counting only the distinct ones).

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

Adding to 20001031020 its reverse (2013010002), we get a palindrome (22014041022).

The spelling of 20001031020 in words is "twenty billion, one million, thirty-one thousand, twenty".