20800331206640 has 40 divisors (see below), whose sum is σ = 48943429951248. Its totient is φ = 8219889920000.

The previous prime is 20800331206637. The next prime is 20800331206643. The reversal of 20800331206640 is 4660213300802.

It is an interprime number because it is at equal distance from previous prime (20800331206637) and next prime (20800331206643).

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 20800331206640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20800331206643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1566283361 + ... + 1566296640.

Almost surely, 2^{20800331206640} is an apocalyptic number.

20800331206640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20800331206640 is an abundant number, since it is smaller than the sum of its proper divisors (28143098744608).

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

20800331206640 is a wasteful number, since it uses less digits than its factorization.

20800331206640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132580097 (or 3132580091 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 20800331206640 in words is "twenty trillion, eight hundred billion, three hundred thirty-one million, two hundred six thousand, six hundred forty".