20011012020 has 72 divisors (see below), whose sum is σ = 60936397704. Its totient is φ = 5315493888.

The previous prime is 20011012019. The next prime is 20011012033. The reversal of 20011012020 is 2021011002.

It can be written as a sum of positive squares in 4 ways, for example, as 2798621604 + 17212390416 = 52902^2 + 131196^2 .

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 = 20011011993 and 20011012011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170029 + ... + 262548.

It is an arithmetic number, because the mean of its divisors is an integer number (846338857).

Almost surely, 2^20011012020 is an apocalyptic number.

20011012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011012020 is an abundant number, since it is smaller than the sum of its proper divisors (40925385684).

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

20011012020 is a wasteful number, since it uses less digits than its factorization.

20011012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432849 (or 432844 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20011012020 its reverse (2021011002), we get a palindrome (22032023022).

The spelling of 20011012020 in words is "twenty billion, eleven million, twelve thousand, twenty".