20021203202220 has 288 divisors, whose sum is σ = 68067548640000. Its totient is φ = 4720712762880.

The previous prime is 20021203202219. The next prime is 20021203202269. The reversal of 20021203202220 is 2220230212002.

20021203202220 is a `hidden beast` number, since 2 + 0 + 0 + 2 + 120 + 320 + 2 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20021203202193 and 20021203202202.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 205299031 + ... + 205396529.

It is an arithmetic number, because the mean of its divisors is an integer number (236345655000).

Almost surely, 2^{20021203202220} is an apocalyptic number.

20021203202220 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 20021203202220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34033774320000).

20021203202220 is an abundant number, since it is smaller than the sum of its proper divisors (48046345437780).

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

20021203202220 is a wasteful number, since it uses less digits than its factorization.

20021203202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100365 (or 100360 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20021203202220 its reverse (2220230212002), we get a palindrome (22241433414222).

The spelling of 20021203202220 in words is "twenty trillion, twenty-one billion, two hundred three million, two hundred two thousand, two hundred twenty".