20603003551 has 4 divisors (see below), whose sum is σ = 22187849992. Its totient is φ = 19018157112.

The previous prime is 20603003543. The next prime is 20603003567. The reversal of 20603003551 is 15530030602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15530030602 = 2 ⋅7765015301.

It is a cyclic number.

It is not a de Polignac number, because 20603003551 - 2³ = 20603003543 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 (20603003581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792423201 + ... + 792423226.

It is an arithmetic number, because the mean of its divisors is an integer number (5546962498).

Almost surely, 2^20603003551 is an apocalyptic number.

20603003551 is a deficient number, since it is larger than the sum of its proper divisors (1584846441).

20603003551 is a wasteful number, since it uses less digits than its factorization.

20603003551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584846440.

The product of its (nonzero) digits is 2700, while the sum is 25.

The spelling of 20603003551 in words is "twenty billion, six hundred three million, three thousand, five hundred fifty-one".