20415554215444 has 24 divisors (see below), whose sum is σ = 35744291418528. Its totient is φ = 10202900016480.

The previous prime is 20415554215429. The next prime is 20415554215481. The reversal of 20415554215444 is 44451245551402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20415554215394 and 20415554215403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206445699 + ... + 206544565.

It is an arithmetic number, because the mean of its divisors is an integer number (1489345475772).

Almost surely, 2^{20415554215444} is an apocalyptic number.

It is an amenable number.

20415554215444 is a deficient number, since it is larger than the sum of its proper divisors (15328737203084).

20415554215444 is a wasteful number, since it uses less digits than its factorization.

20415554215444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123015 (or 123013 counting only the distinct ones).

The product of its (nonzero) digits is 2560000, while the sum is 46.

Adding to 20415554215444 its reverse (44451245551402), we get a palindrome (64866799766846).

The spelling of 20415554215444 in words is "twenty trillion, four hundred fifteen billion, five hundred fifty-four million, two hundred fifteen thousand, four hundred forty-four".