20656525671556 has 12 divisors (see below), whose sum is σ = 36150027419968. Its totient is φ = 10327946408712.

The previous prime is 20656525671547. The next prime is 20656525671631. The reversal of 20656525671556 is 65517652565602.

It is a super-2 number, since 2×20656525671556² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20656525671494 and 20656525671503.

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, 78959856 + ... + 79221031.

Almost surely, 2^{20656525671556} is an apocalyptic number.

It is an amenable number.

20656525671556 is a deficient number, since it is larger than the sum of its proper divisors (15493501748412).

20656525671556 is a wasteful number, since it uses less digits than its factorization.

20656525671556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158213538 (or 158213536 counting only the distinct ones).

The product of its (nonzero) digits is 113400000, while the sum is 61.

The spelling of 20656525671556 in words is "twenty trillion, six hundred fifty-six billion, five hundred twenty-five million, six hundred seventy-one thousand, five hundred fifty-six".