20171881505960 has 16 divisors (see below), whose sum is σ = 45386733388500. Its totient is φ = 8068752602368.

The previous prime is 20171881505953. The next prime is 20171881505987. The reversal of 20171881505960 is 6950518817102.

It can be written as a sum of positive squares in 2 ways, for example, as 20171434352644 + 447153316 = 4491262^2 + 21146^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252148518785 + ... + 252148518864.

Almost surely, 2^{20171881505960} is an apocalyptic number.

20171881505960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20171881505960 is an abundant number, since it is smaller than the sum of its proper divisors (25214851882540).

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

20171881505960 is a wasteful number, since it uses less digits than its factorization.

20171881505960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504297037660 (or 504297037656 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 53.

The spelling of 20171881505960 in words is "twenty trillion, one hundred seventy-one billion, eight hundred eighty-one million, five hundred five thousand, nine hundred sixty".