20156202868356 has 81 divisors (see below), whose sum is σ = 51228974806191. Its totient is φ = 6682198201344.

The previous prime is 20156202868289. The next prime is 20156202868363. The reversal of 20156202868356 is 65386820265102.

The square root of 20156202868356 is 4489566.

It is a perfect power (a square), and thus also a powerful number.

20156202868356 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 6 + 2 + 0 + 286 + 8 + 356 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5109561868356 + 15046641000000 = 2260434^2 + 3879000^2 .

It is a super-2 number, since 2×20156202868356² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5198915490 + ... + 5198919366.

Almost surely, 2^{20156202868356} is an apocalyptic number.

20156202868356 is the 4489566-th square number.

It is an amenable number.

20156202868356 is an abundant number, since it is smaller than the sum of its proper divisors (31072771937835).

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

20156202868356 is an frugal number, since it uses more digits than its factorization.

20156202868356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8150 (or 4075 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 20156202868356 in words is "twenty trillion, one hundred fifty-six billion, two hundred two million, eight hundred sixty-eight thousand, three hundred fifty-six".