20601391508 has 12 divisors (see below), whose sum is σ = 36056850900. Its totient is φ = 10299434112.

The previous prime is 20601391477. The next prime is 20601391511. The reversal of 20601391508 is 80519310602.

It can be written as a sum of positive squares in 2 ways, for example, as 17636371204 + 2965020304 = 132802^2 + 54452^2 .

It is a congruent number.

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, 278183 + ... + 344366.

It is an arithmetic number, because the mean of its divisors is an integer number (3004737575).

Almost surely, 2^20601391508 is an apocalyptic number.

It is an amenable number.

20601391508 is a deficient number, since it is larger than the sum of its proper divisors (15455459392).

20601391508 is a wasteful number, since it uses less digits than its factorization.

20601391508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630826 (or 630824 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 20601391508 in words is "twenty billion, six hundred one million, three hundred ninety-one thousand, five hundred eight".