20121200000020 has 24 divisors (see below), whose sum is σ = 48290880000384. Its totient is φ = 6898697142816.

The previous prime is 20121199999987. The next prime is 20121200000039. The reversal of 20121200000020 is 2000000212102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20121199999952 and 20121200000006.

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, 71861428432 + ... + 71861428711.

It is an arithmetic number, because the mean of its divisors is an integer number (2012120000016).

Almost surely, 2^{20121200000020} is an apocalyptic number.

20121200000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121200000020 is an abundant number, since it is smaller than the sum of its proper divisors (28169680000364).

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

20121200000020 is a wasteful number, since it uses less digits than its factorization.

20121200000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143722857159 (or 143722857157 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20121200000020 its reverse (2000000212102), we get a palindrome (22121200212122).

The spelling of 20121200000020 in words is "twenty trillion, one hundred twenty-one billion, two hundred million, twenty", and thus it is an aban number.