20021220200020 has 144 divisors (see below), whose sum is σ = 49218972243840. Its totient is φ = 6814092999168.

The previous prime is 20021220199997. The next prime is 20021220200081. The reversal of 20021220200020 is 2000202212002.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1836832 + ... + 6589111.

It is an arithmetic number, because the mean of its divisors is an integer number (341798418360).

Almost surely, 2^{20021220200020} is an apocalyptic number.

20021220200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021220200020 is an abundant number, since it is smaller than the sum of its proper divisors (29197752043820).

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

20021220200020 is a wasteful number, since it uses less digits than its factorization.

20021220200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8426034 (or 8426019 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20021220200020 its reverse (2000202212002), we get a palindrome (22021422412022).

The spelling of 20021220200020 in words is "twenty trillion, twenty-one billion, two hundred twenty million, two hundred thousand, twenty".