20551143051520 has 72 divisors (see below), whose sum is σ = 49779515845080. Its totient is φ = 8128092487680.

The previous prime is 20551143051479. The next prime is 20551143051589. The reversal of 20551143051520 is 2515034115502.

It can be written as a sum of positive squares in 4 ways, for example, as 94844289024 + 20456298762496 = 307968^2 + 4522864^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90085971 + ... + 90313810.

It is an arithmetic number, because the mean of its divisors is an integer number (691382164515).

Almost surely, 2^{20551143051520} is an apocalyptic number.

20551143051520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20551143051520 is an abundant number, since it is smaller than the sum of its proper divisors (29228372793560).

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

20551143051520 is an equidigital number, since it uses as much as digits as its factorization.

20551143051520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180399891 (or 180399877 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 20551143051520 in words is "twenty trillion, five hundred fifty-one billion, one hundred forty-three million, fifty-one thousand, five hundred twenty".