20434020550 has 12 divisors (see below), whose sum is σ = 38007278316. Its totient is φ = 8173608200.

The previous prime is 20434020539. The next prime is 20434020557. The reversal of 20434020550 is 5502043402.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434020557) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 204340156 + ... + 204340255.

It is an arithmetic number, because the mean of its divisors is an integer number (3167273193).

Almost surely, 2^20434020550 is an apocalyptic number.

20434020550 is a deficient number, since it is larger than the sum of its proper divisors (17573257766).

20434020550 is a wasteful number, since it uses less digits than its factorization.

20434020550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408680423 (or 408680418 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

Adding to 20434020550 its reverse (5502043402), we get a palindrome (25936063952).

The spelling of 20434020550 in words is "twenty billion, four hundred thirty-four million, twenty thousand, five hundred fifty".