20121200220020 has 24 divisors (see below), whose sum is σ = 42418934949384. Its totient is φ = 8017163042816.

The previous prime is 20121200220019. The next prime is 20121200220047. The reversal of 20121200220020 is 2002200212102.

It can be written as a sum of positive squares in 4 ways, for example, as 11120504206564 + 9000696013456 = 3334742^2 + 3000116^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20121200219977 and 20121200220004.

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, 1957310057 + ... + 1957320336.

It is an arithmetic number, because the mean of its divisors is an integer number (1767455622891).

Almost surely, 2^{20121200220020} is an apocalyptic number.

20121200220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121200220020 is an abundant number, since it is smaller than the sum of its proper divisors (22297734729364).

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

20121200220020 is a wasteful number, since it uses less digits than its factorization.

20121200220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914630659 (or 3914630657 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20121200220020 its reverse (2002200212102), we get a palindrome (22123400432122).

The spelling of 20121200220020 in words is "twenty trillion, one hundred twenty-one billion, two hundred million, two hundred twenty thousand, twenty".