20018135021696 has 64 divisors (see below), whose sum is σ = 45612364896000. Its totient is φ = 8572544526336.

The previous prime is 20018135021671. The next prime is 20018135021699. The reversal of 20018135021696 is 69612053181002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (20018135021699) 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, 7511336 + ... + 9821223.

It is an arithmetic number, because the mean of its divisors is an integer number (712693201500).

Almost surely, 2^{20018135021696} is an apocalyptic number.

It is an amenable number.

20018135021696 is an abundant number, since it is smaller than the sum of its proper divisors (25594229874304).

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

20018135021696 is a wasteful number, since it uses less digits than its factorization.

20018135021696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17333869 (or 17333857 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 20018135021696 in words is "twenty trillion, eighteen billion, one hundred thirty-five million, twenty-one thousand, six hundred ninety-six".