20603144550 has 48 divisors (see below), whose sum is σ = 51179380560. Its totient is φ = 5485184640.

The previous prime is 20603144503. The next prime is 20603144563. The reversal of 20603144550 is 5544130602.

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20085 + ... + 203984.

It is an arithmetic number, because the mean of its divisors is an integer number (1066237095).

Almost surely, 2^20603144550 is an apocalyptic number.

20603144550 is an abundant number, since it is smaller than the sum of its proper divisors (30576236010).

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

20603144550 is a wasteful number, since it uses less digits than its factorization.

20603144550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224697 (or 224692 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 20603144550 in words is "twenty billion, six hundred three million, one hundred forty-four thousand, five hundred fifty".