20043215550 has 72 divisors (see below), whose sum is σ = 53929108584. Its totient is φ = 5336950080.

The previous prime is 20043215461. The next prime is 20043215627. The reversal of 20043215550 is 5551234002.

It is a happy number.

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 274744 + ... + 339956.

It is an arithmetic number, because the mean of its divisors is an integer number (749015397).

Almost surely, 2^20043215550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20043215550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26964554292).

20043215550 is an abundant number, since it is smaller than the sum of its proper divisors (33885893034).

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

20043215550 is a wasteful number, since it uses less digits than its factorization.

20043215550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65914 (or 65906 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 20043215550 its reverse (5551234002), we get a palindrome (25594449552).

The spelling of 20043215550 in words is "twenty billion, forty-three million, two hundred fifteen thousand, five hundred fifty".