20761004550 has 384 divisors, whose sum is σ = 64350881280. Its totient is φ = 4390848000.

The previous prime is 20761004543. The next prime is 20761004567. The reversal of 20761004550 is 5540016702.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 191 ways as a sum of consecutive naturals, for example, 49313340 + ... + 49313760.

It is an arithmetic number, because the mean of its divisors is an integer number (167580420).

Almost surely, 2^20761004550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20761004550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32175440640).

20761004550 is an abundant number, since it is smaller than the sum of its proper divisors (43589876730).

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

20761004550 is a wasteful number, since it uses less digits than its factorization.

20761004550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The spelling of 20761004550 in words is "twenty billion, seven hundred sixty-one million, four thousand, five hundred fifty".