20001212012220 has 96 divisors (see below), whose sum is σ = 56056263520320. Its totient is φ = 5328622479360.

The previous prime is 20001212012219. The next prime is 20001212012239. The reversal of 20001212012220 is 2221021210002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20001212012220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 831258990 + ... + 831283050.

It is an arithmetic number, because the mean of its divisors is an integer number (583919411670).

Almost surely, 2^{20001212012220} is an apocalyptic number.

20001212012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001212012220 is an abundant number, since it is smaller than the sum of its proper divisors (36055051508100).

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

20001212012220 is a wasteful number, since it uses less digits than its factorization.

20001212012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36575 (or 36573 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20001212012220 its reverse (2221021210002), we get a palindrome (22222233222222).

The spelling of 20001212012220 in words is "twenty trillion, one billion, two hundred twelve million, twelve thousand, two hundred twenty".