20317781358 has 48 divisors (see below), whose sum is σ = 50345917440. Its totient is φ = 5801016528.

The previous prime is 20317781329. The next prime is 20317781389. The reversal of 20317781358 is 85318771302.

20317781358 is a `hidden beast` number, since 203 + 17 + 7 + 81 + 358 = 666.

It is a super-2 number, since 2×20317781358² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126603 + ... + 238041.

It is an arithmetic number, because the mean of its divisors is an integer number (1048873280).

Almost surely, 2^20317781358 is an apocalyptic number.

20317781358 is an abundant number, since it is smaller than the sum of its proper divisors (30028136082).

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

20317781358 is a wasteful number, since it uses less digits than its factorization.

20317781358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112901 (or 112898 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

It can be divided in two parts, 2031778 and 1358, that added together give a triangular number (2033136 = T₂₀₁₆).

The spelling of 20317781358 in words is "twenty billion, three hundred seventeen million, seven hundred eighty-one thousand, three hundred fifty-eight".