20450203550 has 144 divisors (see below), whose sum is σ = 46475546208. Its totient is φ = 6556723200.

The previous prime is 20450203549. The next prime is 20450203591. The reversal of 20450203550 is 5530205402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 18307592 + ... + 18308708.

Almost surely, 2^20450203550 is an apocalyptic number.

20450203550 is an abundant number, since it is smaller than the sum of its proper divisors (26025342658).

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

20450203550 is a wasteful number, since it uses less digits than its factorization.

20450203550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 26.

Adding to 20450203550 its reverse (5530205402), we get a palindrome (25980408952).

The spelling of 20450203550 in words is "twenty billion, four hundred fifty million, two hundred three thousand, five hundred fifty".