20805488512 has 16 divisors (see below), whose sum is σ = 41448434400. Its totient is φ = 10402744192.

The previous prime is 20805488497. The next prime is 20805488527. The reversal of 20805488512 is 21588450802.

It is an interprime number because it is at equal distance from previous prime (20805488497) and next prime (20805488527).

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81271312 + ... + 81271567.

It is an arithmetic number, because the mean of its divisors is an integer number (2590527150).

Almost surely, 2^20805488512 is an apocalyptic number.

It is an amenable number.

20805488512 is a deficient number, since it is larger than the sum of its proper divisors (20642945888).

20805488512 is an equidigital number, since it uses as much as digits as its factorization.

20805488512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162542893 (or 162542881 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 43.

The spelling of 20805488512 in words is "twenty billion, eight hundred five million, four hundred eighty-eight thousand, five hundred twelve".