202020010020 has 72 divisors (see below), whose sum is σ = 614974946040. Its totient is φ = 53680273920.

The previous prime is 202020009991. The next prime is 202020010021. The reversal of 202020010020 is 20010020202.

It can be written as a sum of positive squares in 4 ways, for example, as 7523133696 + 194496876324 = 86736^2 + 441018^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 202020009984 and 202020010011.

It is not an unprimeable number, because it can be changed into a prime (202020010021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1946455 + ... + 2047614.

It is an arithmetic number, because the mean of its divisors is an integer number (8541318695).

Almost surely, 2^202020010020 is an apocalyptic number.

202020010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202020010020 is an abundant number, since it is smaller than the sum of its proper divisors (412954936020).

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

202020010020 is a wasteful number, since it uses less digits than its factorization.

202020010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994365 (or 3994360 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 202020010020 its reverse (20010020202), we get a palindrome (222030030222).

The spelling of 202020010020 in words is "two hundred two billion, twenty million, ten thousand, twenty".