20805785008156 has 12 divisors (see below), whose sum is σ = 36848799954792. Its totient is φ = 10277556449648.

The previous prime is 20805785008147. The next prime is 20805785008159. The reversal of 20805785008156 is 65180058750802.

It is a super-3 number, since 3×20805785008156³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20805785008097 and 20805785008106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20805785008159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31334013235 + ... + 31334013898.

It is an arithmetic number, because the mean of its divisors is an integer number (3070733329566).

Almost surely, 2^{20805785008156} is an apocalyptic number.

It is an amenable number.

20805785008156 is a deficient number, since it is larger than the sum of its proper divisors (16043014946636).

20805785008156 is a wasteful number, since it uses less digits than its factorization.

20805785008156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62668027220 (or 62668027218 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 55.

The spelling of 20805785008156 in words is "twenty trillion, eight hundred five billion, seven hundred eighty-five million, eight thousand, one hundred fifty-six".