20544045100 has 18 divisors (see below), whose sum is σ = 44580578084. Its totient is φ = 8217618000.

The previous prime is 20544045091. The next prime is 20544045101. The reversal of 20544045100 is 154044502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20544045101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102720126 + ... + 102720325.

Almost surely, 2^20544045100 is an apocalyptic number.

20544045100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20544045100 is an abundant number, since it is smaller than the sum of its proper divisors (24036532984).

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

20544045100 is a wasteful number, since it uses less digits than its factorization.

20544045100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205440465 (or 205440458 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 20544045100 its reverse (154044502), we get a palindrome (20698089602).

The spelling of 20544045100 in words is "twenty billion, five hundred forty-four million, forty-five thousand, one hundred".