20870767556 has 12 divisors (see below), whose sum is σ = 36713087292. Its totient is φ = 10381314048.

The previous prime is 20870767537. The next prime is 20870767601. The reversal of 20870767556 is 65576707802.

It can be written as a sum of positive squares in 2 ways, for example, as 7150393600 + 13720373956 = 84560^2 + 117134^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20870767498 and 20870767507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13516565 + ... + 13518108.

It is an arithmetic number, because the mean of its divisors is an integer number (3059423941).

Almost surely, 2^20870767556 is an apocalyptic number.

It is an amenable number.

20870767556 is a deficient number, since it is larger than the sum of its proper divisors (15842319736).

20870767556 is a wasteful number, since it uses less digits than its factorization.

20870767556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27034870 (or 27034868 counting only the distinct ones).

The product of its (nonzero) digits is 4939200, while the sum is 53.

The spelling of 20870767556 in words is "twenty billion, eight hundred seventy million, seven hundred sixty-seven thousand, five hundred fifty-six".