20012120201220 has 96 divisors (see below), whose sum is σ = 64257347443968. Its totient is φ = 4558587274752.

The previous prime is 20012120201201. The next prime is 20012120201221. The reversal of 20012120201220 is 2210202121002.

It is a super-2 number, since 2×20012120201220² (a number of 27 digits) contains 22 as substring.

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 20012120201220.

It is not an unprimeable number, because it can be changed into a prime (20012120201221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81187359 + ... + 81433478.

It is an arithmetic number, because the mean of its divisors is an integer number (669347369208).

Almost surely, 2^{20012120201220} is an apocalyptic number.

20012120201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012120201220 is an abundant number, since it is smaller than the sum of its proper divisors (44245227242748).

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

20012120201220 is a wasteful number, since it uses less digits than its factorization.

20012120201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162621149 (or 162621147 counting only the distinct ones).

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

Adding to 20012120201220 its reverse (2210202121002), we get a palindrome (22222322322222).

The spelling of 20012120201220 in words is "twenty trillion, twelve billion, one hundred twenty million, two hundred one thousand, two hundred twenty".