20808361356 has 12 divisors (see below), whose sum is σ = 48552843192. Its totient is φ = 6936120448.

The previous prime is 20808361337. The next prime is 20808361363. The reversal of 20808361356 is 65316380802.

It is a tau number, because it is divible by the number of its divisors (12).

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, 867015045 + ... + 867015068.

It is an arithmetic number, because the mean of its divisors is an integer number (4046070266).

Almost surely, 2^20808361356 is an apocalyptic number.

It is an amenable number.

20808361356 is an abundant number, since it is smaller than the sum of its proper divisors (27744481836).

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

20808361356 is a wasteful number, since it uses less digits than its factorization.

20808361356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734030120 (or 1734030118 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 20808361356 in words is "twenty billion, eight hundred eight million, three hundred sixty-one thousand, three hundred fifty-six".