11555040020 has 24 divisors (see below), whose sum is σ = 24372490464. Its totient is φ = 4601652896.

The previous prime is 11555039971. The next prime is 11555040031. The reversal of 11555040020 is 2004055511.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1268042 + ... + 1277121.

It is an arithmetic number, because the mean of its divisors is an integer number (1015520436).

Almost surely, 2^11555040020 is an apocalyptic number.

11555040020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11555040020 is an abundant number, since it is smaller than the sum of its proper divisors (12817450444).

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

11555040020 is a wasteful number, since it uses less digits than its factorization.

11555040020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545399 (or 2545397 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

Adding to 11555040020 its reverse (2004055511), we get a palindrome (13559095531).

The spelling of 11555040020 in words is "eleven billion, five hundred fifty-five million, forty thousand, twenty".