20100221202020 has 48 divisors (see below), whose sum is σ = 44927430202368. Its totient is φ = 7527523530240.

The previous prime is 20100221201947. The next prime is 20100221202029. The reversal of 20100221202020 is 2020212200102.

It is a junction number, because it is equal to n+sod(n) for n = 20100221201986 and 20100221202004.

It is not an unprimeable number, because it can be changed into a prime (20100221202029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154695002 + ... + 154824881.

It is an arithmetic number, because the mean of its divisors is an integer number (935988129216).

Almost surely, 2^{20100221202020} is an apocalyptic number.

20100221202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100221202020 is an abundant number, since it is smaller than the sum of its proper divisors (24827209000348).

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

20100221202020 is a wasteful number, since it uses less digits than its factorization.

20100221202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309520100 (or 309520098 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20100221202020 its reverse (2020212200102), we get a palindrome (22120433402122).

The spelling of 20100221202020 in words is "twenty trillion, one hundred billion, two hundred twenty-one million, two hundred two thousand, twenty".