20932915538 has 8 divisors (see below), whose sum is σ = 32248005132. Its totient is φ = 10183580496.

The previous prime is 20932915529. The next prime is 20932915567. The reversal of 20932915538 is 83551923902.

It can be written as a sum of positive squares in 2 ways, for example, as 20919861769 + 13053769 = 144637^2 + 3613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20932915492 and 20932915501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141438545 + ... + 141438692.

Almost surely, 2^20932915538 is an apocalyptic number.

20932915538 is a deficient number, since it is larger than the sum of its proper divisors (11315089594).

20932915538 is a wasteful number, since it uses less digits than its factorization.

20932915538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282877276.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 20932915538 in words is "twenty billion, nine hundred thirty-two million, nine hundred fifteen thousand, five hundred thirty-eight".