20994271236 has 243 divisors, whose sum is σ = 59319966069. Its totient is φ = 6259420800.

The previous prime is 20994271219. The next prime is 20994271289. The reversal of 20994271236 is 63217249902.

The square root of 20994271236 is 144894.

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

20994271236 is a `hidden beast` number, since 209 + 9 + 427 + 12 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1011621636 + 19982649600 = 31806^2 + 141360^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20994271191 and 20994271200.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 512055376 + ... + 512055416.

Almost surely, 2^20994271236 is an apocalyptic number.

20994271236 is the 144894-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20994271236

20994271236 is an abundant number, since it is smaller than the sum of its proper divisors (38325694833).

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

20994271236 is a wasteful number, since it uses less digits than its factorization.

20994271236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

It can be divided in two parts, 20994 and 271236, that added together give a triangular number (292230 = T₇₆₄).

The spelling of 20994271236 in words is "twenty billion, nine hundred ninety-four million, two hundred seventy-one thousand, two hundred thirty-six".