202021021020020 has 24 divisors (see below), whose sum is σ = 424282506496800. Its totient is φ = 80801101292832.

The previous prime is 202021021020019. The next prime is 202021021020023. The reversal of 202021021020020 is 20020120120202.

It is a junction number, because it is equal to n+sod(n) for n = 202021021019977 and 202021021020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202021021020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456467990 + ... + 456910349.

It is an arithmetic number, because the mean of its divisors is an integer number (17678437770700).

Almost surely, 2^{202021021020020} is an apocalyptic number.

202021021020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202021021020020 is an abundant number, since it is smaller than the sum of its proper divisors (222261485476780).

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

202021021020020 is a wasteful number, since it uses less digits than its factorization.

202021021020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913389407 (or 913389405 counting only the distinct ones).

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

Adding to 202021021020020 its reverse (20020120120202), we get a palindrome (222041141140222).

The spelling of 202021021020020 in words is "two hundred two trillion, twenty-one billion, twenty-one million, twenty thousand, twenty".