20551041520 has 40 divisors (see below), whose sum is σ = 48564480960. Its totient is φ = 8085653760.

The previous prime is 20551041509. The next prime is 20551041527. The reversal of 20551041520 is 2514015502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551041527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2100760 + ... + 2110519.

It is an arithmetic number, because the mean of its divisors is an integer number (1214112024).

Almost surely, 2^20551041520 is an apocalyptic number.

20551041520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20551041520 is an abundant number, since it is smaller than the sum of its proper divisors (28013439440).

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

20551041520 is a wasteful number, since it uses less digits than its factorization.

20551041520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211353 (or 4211347 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 20551041520 in words is "twenty billion, five hundred fifty-one million, forty-one thousand, five hundred twenty".