11651920020 has 144 divisors (see below), whose sum is σ = 40302072720. Its totient is φ = 2699440128.

The previous prime is 11651920013. The next prime is 11651920073. The reversal of 11651920020 is 2002915611.

11651920020 is a `hidden beast` number, since 1 + 1 + 651 + 9 + 2 + 0 + 0 + 2 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1469495556 + 10182424464 = 38334^2 + 100908^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 106675 + ... + 186234.

It is an arithmetic number, because the mean of its divisors is an integer number (279875505).

Almost surely, 2^11651920020 is an apocalyptic number.

11651920020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11651920020 is an abundant number, since it is smaller than the sum of its proper divisors (28650152700).

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

11651920020 is a wasteful number, since it uses less digits than its factorization.

11651920020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292954 (or 292949 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 11651920020 in words is "eleven billion, six hundred fifty-one million, nine hundred twenty thousand, twenty".