20111212020 has 24 divisors (see below), whose sum is σ = 56311393824. Its totient is φ = 5362989856.

The previous prime is 20111212013. The next prime is 20111212031. The reversal of 20111212020 is 2021211102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20111211987 and 20111212005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167593374 + ... + 167593493.

It is an arithmetic number, because the mean of its divisors is an integer number (2346308076).

Almost surely, 2^20111212020 is an apocalyptic number.

20111212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111212020 is an abundant number, since it is smaller than the sum of its proper divisors (36200181804).

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

20111212020 is a wasteful number, since it uses less digits than its factorization.

20111212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335186879 (or 335186877 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20111212020 its reverse (2021211102), we get a palindrome (22132423122).

The spelling of 20111212020 in words is "twenty billion, one hundred eleven million, two hundred twelve thousand, twenty".