20961377188 has 24 divisors (see below), whose sum is σ = 37461909240. Its totient is φ = 10260307200.

The previous prime is 20961377183. The next prime is 20961377197. The reversal of 20961377188 is 88177316902.

It can be written as a sum of positive squares in 4 ways, for example, as 8783813284 + 12177563904 = 93722^2 + 110352^2 .

It is not an unprimeable number, because it can be changed into a prime (20961377183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255531 + ... + 327442.

It is an arithmetic number, because the mean of its divisors is an integer number (1560912885).

Almost surely, 2^20961377188 is an apocalyptic number.

It is an amenable number.

20961377188 is a deficient number, since it is larger than the sum of its proper divisors (16500532052).

20961377188 is a wasteful number, since it uses less digits than its factorization.

20961377188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583167 (or 583165 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 20961377188 in words is "twenty billion, nine hundred sixty-one million, three hundred seventy-seven thousand, one hundred eighty-eight".