202023117540 has 144 divisors (see below), whose sum is σ = 645263673600. Its totient is φ = 51021010944.

The previous prime is 202023117539. The next prime is 202023117557. The reversal of 202023117540 is 45711320202.

202023117540 is a `hidden beast` number, since 2 + 0 + 2 + 0 + 2 + 3 + 117 + 540 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13395444 + ... + 13410516.

Almost surely, 2^202023117540 is an apocalyptic number.

202023117540 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 202023117540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322631836800).

202023117540 is an abundant number, since it is smaller than the sum of its proper divisors (443240556060).

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

202023117540 is a wasteful number, since it uses less digits than its factorization.

202023117540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19026 (or 19021 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

Adding to 202023117540 its reverse (45711320202), we get a palindrome (247734437742).

The spelling of 202023117540 in words is "two hundred two billion, twenty-three million, one hundred seventeen thousand, five hundred forty".