20105815732 has 24 divisors (see below), whose sum is σ = 37055067840. Its totient is φ = 9519168960.

The previous prime is 20105815721. The next prime is 20105815753. The reversal of 20105815732 is 23751850102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95232 + ... + 221992.

It is an arithmetic number, because the mean of its divisors is an integer number (1543961160).

Almost surely, 2^20105815732 is an apocalyptic number.

It is an amenable number.

20105815732 is a deficient number, since it is larger than the sum of its proper divisors (16949252108).

20105815732 is a wasteful number, since it uses less digits than its factorization.

20105815732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128871 (or 128869 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 20105815732 in words is "twenty billion, one hundred five million, eight hundred fifteen thousand, seven hundred thirty-two".