20005017550 has 48 divisors (see below), whose sum is σ = 43674302880. Its totient is φ = 6673484160.

The previous prime is 20005017523. The next prime is 20005017569. The reversal of 20005017550 is 5571050002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 23 ways as a sum of consecutive naturals, for example, 759445 + ... + 785344.

It is an arithmetic number, because the mean of its divisors is an integer number (909881310).

Almost surely, 2^20005017550 is an apocalyptic number.

20005017550 is an abundant number, since it is smaller than the sum of its proper divisors (23669285330).

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

20005017550 is a wasteful number, since it uses less digits than its factorization.

20005017550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544845 (or 1544840 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 25.

Adding to 20005017550 its reverse (5571050002), we get a palindrome (25576067552).

The spelling of 20005017550 in words is "twenty billion, five million, seventeen thousand, five hundred fifty".