20554844845503 has 16 divisors (see below), whose sum is σ = 28855013598080. Its totient is φ = 12979258422624.

The previous prime is 20554844845477. The next prime is 20554844845529. The reversal of 20554844845503 is 30554844845502.

It is an interprime number because it is at equal distance from previous prime (20554844845477) and next prime (20554844845529).

It is not a de Polignac number, because 20554844845503 - 2⁵ = 20554844845471 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20554844843503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37906876 + ... + 38445297.

It is an arithmetic number, because the mean of its divisors is an integer number (1803438349880).

Almost surely, 2^{20554844845503} is an apocalyptic number.

20554844845503 is a deficient number, since it is larger than the sum of its proper divisors (8300168752577).

20554844845503 is a wasteful number, since it uses less digits than its factorization.

20554844845503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76356918.

The product of its (nonzero) digits is 61440000, while the sum is 57.

Subtracting 20554844845503 from its reverse (30554844845502), we obtain a palindrome (9999999999999).

The spelling of 20554844845503 in words is "twenty trillion, five hundred fifty-four billion, eight hundred forty-four million, eight hundred forty-five thousand, five hundred three".