202440404020 has 24 divisors (see below), whose sum is σ = 450132193224. Its totient is φ = 76212857856.

The previous prime is 202440404011. The next prime is 202440404021. The reversal of 202440404020 is 20404044202.

It can be written as a sum of positive squares in 4 ways, for example, as 53658942736 + 148781461284 = 231644^2 + 385722^2 .

It is a junction number, because it is equal to n+sod(n) for n = 202440403982 and 202440404000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202440404021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297706137 + ... + 297706816.

It is an arithmetic number, because the mean of its divisors is an integer number (18755508051).

Almost surely, 2^202440404020 is an apocalyptic number.

202440404020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202440404020 is an abundant number, since it is smaller than the sum of its proper divisors (247691789204).

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

202440404020 is a wasteful number, since it uses less digits than its factorization.

202440404020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595412979 (or 595412977 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 202440404020 its reverse (20404044202), we get a palindrome (222844448222).

The spelling of 202440404020 in words is "two hundred two billion, four hundred forty million, four hundred four thousand, twenty".