20001002021220 has 384 divisors, whose sum is σ = 65885886259200. Its totient is φ = 4479545548800.

The previous prime is 20001002021191. The next prime is 20001002021239. The reversal of 20001002021220 is 2212020010002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20001002021196 and 20001002021205.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 182371161 + ... + 182480799.

It is an arithmetic number, because the mean of its divisors is an integer number (171577828800).

Almost surely, 2^{20001002021220} is an apocalyptic number.

20001002021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20001002021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32942943129600).

20001002021220 is an abundant number, since it is smaller than the sum of its proper divisors (45884884237980).

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

20001002021220 is a wasteful number, since it uses less digits than its factorization.

20001002021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109979 (or 109977 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20001002021220 its reverse (2212020010002), we get a palindrome (22213022031222).

The spelling of 20001002021220 in words is "twenty trillion, one billion, two million, twenty-one thousand, two hundred twenty".