20908908535876 has 27 divisors (see below), whose sum is σ = 38869877638039. Its totient is φ = 9839413207808.

The previous prime is 20908908535861. The next prime is 20908908535939. The reversal of 20908908535876 is 67853580980902.

The square root of 20908908535876 is 4572626.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 6158884524100 + 14750024011776 = 2481710^2 + 3840576^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 155402040 + ... + 155536528.

Almost surely, 2^{20908908535876} is an apocalyptic number.

20908908535876 is the 4572626-th square number.

It is an amenable number.

20908908535876 is a deficient number, since it is larger than the sum of its proper divisors (17960969102163).

20908908535876 is an frugal number, since it uses more digits than its factorization.

20908908535876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269016 (or 134508 counting only the distinct ones).

The product of its (nonzero) digits is 261273600, while the sum is 70.

The spelling of 20908908535876 in words is "twenty trillion, nine hundred eight billion, nine hundred eight million, five hundred thirty-five thousand, eight hundred seventy-six".