20318097935781 has 24 divisors (see below), whose sum is σ = 29651770273944. Its totient is φ = 13405372784640.

The previous prime is 20318097935771. The next prime is 20318097935801. The reversal of 20318097935781 is 18753979081302.

20318097935781 is a `hidden beast` number, since 20 + 3 + 180 + 9 + 7 + 9 + 357 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7858821682881 + 12459276252900 = 2803359^2 + 3529770^2 .

It is not a de Polignac number, because 20318097935781 - 2¹¹ = 20318097933733 is a prime.

It is a super-2 number, since 2×20318097935781² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20318097935701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32089621 + ... + 32716661.

It is an arithmetic number, because the mean of its divisors is an integer number (1235490428081).

Almost surely, 2^{20318097935781} is an apocalyptic number.

It is an amenable number.

20318097935781 is a deficient number, since it is larger than the sum of its proper divisors (9333672338163).

20318097935781 is a wasteful number, since it uses less digits than its factorization.

20318097935781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664261 (or 664258 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 63.

The spelling of 20318097935781 in words is "twenty trillion, three hundred eighteen billion, ninety-seven million, nine hundred thirty-five thousand, seven hundred eighty-one".