20503131732 has 18 divisors (see below), whose sum is σ = 51827360858. Its totient is φ = 6834377232.

The previous prime is 20503131721. The next prime is 20503131749. The reversal of 20503131732 is 23713130502.

20503131732 is a `hidden beast` number, since 20 + 503 + 131 + 7 + 3 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20231079696 + 272052036 = 142236^2 + 16494^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 20503131696 and 20503131705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284765683 + ... + 284765754.

Almost surely, 2^20503131732 is an apocalyptic number.

It is an amenable number.

20503131732 is an abundant number, since it is smaller than the sum of its proper divisors (31324229126).

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

20503131732 is a wasteful number, since it uses less digits than its factorization.

20503131732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569531447 (or 569531442 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The spelling of 20503131732 in words is "twenty billion, five hundred three million, one hundred thirty-one thousand, seven hundred thirty-two".