20642786982 has 20 divisors (see below), whose sum is σ = 46255134156. Its totient is φ = 6880928940.

The previous prime is 20642786981. The next prime is 20642786993. The reversal of 20642786982 is 28968724602.

20642786982 is a `hidden beast` number, since 206 + 427 + 8 + 6 + 9 + 8 + 2 = 666.

It is a super-2 number, since 2×20642786982² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642786981) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 63712144 + ... + 63712467.

Almost surely, 2^20642786982 is an apocalyptic number.

20642786982 is an abundant number, since it is smaller than the sum of its proper divisors (25612347174).

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

20642786982 is a wasteful number, since it uses less digits than its factorization.

20642786982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127424625 (or 127424616 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 20642786982 in words is "twenty billion, six hundred forty-two million, seven hundred eighty-six thousand, nine hundred eighty-two".