20166681852 has 36 divisors (see below), whose sum is σ = 53659886280. Its totient is φ = 6368425632.

The previous prime is 20166681841. The next prime is 20166681967. The reversal of 20166681852 is 25818666102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20166681852² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20166681798 and 20166681807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14741043 + ... + 14742410.

Almost surely, 2^20166681852 is an apocalyptic number.

It is an amenable number.

20166681852 is an abundant number, since it is smaller than the sum of its proper divisors (33493204428).

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

20166681852 is a wasteful number, since it uses less digits than its factorization.

20166681852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29483482 (or 29483477 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 20166681852 in words is "twenty billion, one hundred sixty-six million, six hundred eighty-one thousand, eight hundred fifty-two".