20010020001220 has 12 divisors (see below), whose sum is σ = 42021042002604. Its totient is φ = 8004008000480.

The previous prime is 20010020001149. The next prime is 20010020001221. The reversal of 20010020001220 is 2210002001002.

It can be written as a sum of positive squares in 2 ways, for example, as 10621446011136 + 9388573990084 = 3259056^2 + 3064078^2 .

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 = 20010020001197 and 20010020001206.

It is not an unprimeable number, because it can be changed into a prime (20010020001221) 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 3 ways as a sum of consecutive naturals, for example, 500250500011 + ... + 500250500050.

It is an arithmetic number, because the mean of its divisors is an integer number (3501753500217).

Almost surely, 2^{20010020001220} is an apocalyptic number.

20010020001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010020001220 is an abundant number, since it is smaller than the sum of its proper divisors (22011022001384).

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

20010020001220 is a wasteful number, since it uses less digits than its factorization.

20010020001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000501000070 (or 1000501000068 counting only the distinct ones).

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

Adding to 20010020001220 its reverse (2210002001002), we get a palindrome (22220022002222).

The spelling of 20010020001220 in words is "twenty trillion, ten billion, twenty million, one thousand, two hundred twenty".