20544145400 has 24 divisors (see below), whose sum is σ = 47765138520. Its totient is φ = 8217658080.

The previous prime is 20544145381. The next prime is 20544145421. The reversal of 20544145400 is 454144502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51360164 + ... + 51360563.

It is an arithmetic number, because the mean of its divisors is an integer number (1990214105).

Almost surely, 2^20544145400 is an apocalyptic number.

20544145400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20544145400 is an abundant number, since it is smaller than the sum of its proper divisors (27220993120).

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

20544145400 is a wasteful number, since it uses less digits than its factorization.

20544145400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102720743 (or 102720734 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 20544145400 its reverse (454144502), we get a palindrome (20998289902).

The spelling of 20544145400 in words is "twenty billion, five hundred forty-four million, one hundred forty-five thousand, four hundred".