20691956808058 has 16 divisors (see below), whose sum is σ = 32128264080360. Its totient is φ = 9982981120000.

The previous prime is 20691956808053. The next prime is 20691956808071. The reversal of 20691956808058 is 85080865919602.

It can be written as a sum of positive squares in 4 ways, for example, as 18844567507089 + 1847389300969 = 4341033^2 + 1359187^2 .

It is a super-3 number, since 3×20691956808058³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20691956807984 and 20691956808002.

It is not an unprimeable number, because it can be changed into a prime (20691956808053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111324343 + ... + 111510058.

Almost surely, 2^{20691956808058} is an apocalyptic number.

20691956808058 is a deficient number, since it is larger than the sum of its proper divisors (11436307272302).

20691956808058 is a wasteful number, since it uses less digits than its factorization.

20691956808058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222836033.

The product of its (nonzero) digits is 74649600, while the sum is 67.

The spelling of 20691956808058 in words is "twenty trillion, six hundred ninety-one billion, nine hundred fifty-six million, eight hundred eight thousand, fifty-eight".