20805380651520 has 160 divisors (see below), whose sum is σ = 73902446101440. Its totient is φ = 5548101488640.

The previous prime is 20805380651507. The next prime is 20805380651581. The reversal of 20805380651520 is 2515608350802.

20805380651520 is a `hidden beast` number, since 2 + 0 + 8 + 0 + 53 + 80 + 6 + 515 + 2 + 0 = 666.

20805380651520 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 150432766 + ... + 150571005.

It is an arithmetic number, because the mean of its divisors is an integer number (461890288134).

Almost surely, 2^{20805380651520} is an apocalyptic number.

20805380651520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20805380651520 is an abundant number, since it is smaller than the sum of its proper divisors (53097065449920).

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

20805380651520 is an equidigital number, since it uses as much as digits as its factorization.

20805380651520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301003803 (or 301003781 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 20805380651520 in words is "twenty trillion, eight hundred five billion, three hundred eighty million, six hundred fifty-one thousand, five hundred twenty".