20450203551 has 12 divisors (see below), whose sum is σ = 29573581960. Its totient is φ = 13617592560.

The previous prime is 20450203549. The next prime is 20450203591. The reversal of 20450203551 is 15530205402.

It is a happy number.

20450203551 is a `hidden beast` number, since 2 + 0 + 450 + 203 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 20450203551 - 2¹ = 20450203549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20450203531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1314880 + ... + 1330341.

Almost surely, 2^20450203551 is an apocalyptic number.

20450203551 is a deficient number, since it is larger than the sum of its proper divisors (9123378409).

20450203551 is a wasteful number, since it uses less digits than its factorization.

20450203551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646086 (or 2646083 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 20450203551 its reverse (15530205402), we get a palindrome (35980408953).

The spelling of 20450203551 in words is "twenty billion, four hundred fifty million, two hundred three thousand, five hundred fifty-one".