20771897067560 has 16 divisors (see below), whose sum is σ = 46736768402100. Its totient is φ = 8308758827008.

The previous prime is 20771897067533. The next prime is 20771897067617. The reversal of 20771897067560 is 6576079817702.

It can be written as a sum of positive squares in 2 ways, for example, as 20663370307204 + 108526760356 = 4545698^2 + 329434^2 .

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, 259648713305 + ... + 259648713384.

Almost surely, 2^{20771897067560} is an apocalyptic number.

20771897067560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20771897067560 is an abundant number, since it is smaller than the sum of its proper divisors (25964871334540).

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

20771897067560 is a wasteful number, since it uses less digits than its factorization.

20771897067560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519297426700 (or 519297426696 counting only the distinct ones).

The product of its (nonzero) digits is 62233920, while the sum is 65.

The spelling of 20771897067560 in words is "twenty trillion, seven hundred seventy-one billion, eight hundred ninety-seven million, sixty-seven thousand, five hundred sixty".