20603003550 has 96 divisors (see below), whose sum is σ = 52118985600. Its totient is φ = 5384645760.

The previous prime is 20603003543. The next prime is 20603003567. The reversal of 20603003550 is 5530030602.

It is a self number, because there is not a number n which added to its sum of digits gives 20603003550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3067596 + ... + 3074304.

It is an arithmetic number, because the mean of its divisors is an integer number (542906100).

Almost surely, 2^20603003550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20603003550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26059492800).

20603003550 is an abundant number, since it is smaller than the sum of its proper divisors (31515982050).

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

20603003550 is a wasteful number, since it uses less digits than its factorization.

20603003550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7130 (or 7125 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 24.

The spelling of 20603003550 in words is "twenty billion, six hundred three million, three thousand, five hundred fifty".