20555454466503 has 64 divisors (see below), whose sum is σ = 35295310540800. Its totient is φ = 11703181553280.

The previous prime is 20555454466451. The next prime is 20555454466513. The reversal of 20555454466503 is 30566445455502.

20555454466503 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 545 + 4 + 46 + 6 + 50 + 3 = 666.

It is not a de Polignac number, because 20555454466503 - 2¹⁴ = 20555454450119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20555454466503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555454466513) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31932151 + ... + 32569512.

It is an arithmetic number, because the mean of its divisors is an integer number (551489227200).

Almost surely, 2^{20555454466503} is an apocalyptic number.

20555454466503 is a deficient number, since it is larger than the sum of its proper divisors (14739856074297).

20555454466503 is a wasteful number, since it uses less digits than its factorization.

20555454466503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64501749 (or 64501743 counting only the distinct ones).

The product of its (nonzero) digits is 43200000, while the sum is 54.

The spelling of 20555454466503 in words is "twenty trillion, five hundred fifty-five billion, four hundred fifty-four million, four hundred sixty-six thousand, five hundred three".