20608391136 has 48 divisors (see below), whose sum is σ = 54171621504. Its totient is φ = 6859991424.

The previous prime is 20608391131. The next prime is 20608391143. The reversal of 20608391136 is 63119380602.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 20608391094 and 20608391103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20608391131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77850 + ... + 217433.

It is an arithmetic number, because the mean of its divisors is an integer number (1128575448).

Almost surely, 2^20608391136 is an apocalyptic number.

It is an amenable number.

20608391136 is an abundant number, since it is smaller than the sum of its proper divisors (33563230368).

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

20608391136 is a wasteful number, since it uses less digits than its factorization.

20608391136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296023 (or 296015 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 20608391136 in words is "twenty billion, six hundred eight million, three hundred ninety-one thousand, one hundred thirty-six".