20413321555506 has 64 divisors (see below), whose sum is σ = 45981803630592. Its totient is φ = 5985408600000.

The previous prime is 20413321555489. The next prime is 20413321555553. The reversal of 20413321555506 is 60555512331402.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12879481 + ... + 14377331.

It is an arithmetic number, because the mean of its divisors is an integer number (718465681728).

Almost surely, 2^{20413321555506} is an apocalyptic number.

20413321555506 is an abundant number, since it is smaller than the sum of its proper divisors (25568482075086).

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

20413321555506 is a wasteful number, since it uses less digits than its factorization.

20413321555506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504559.

The product of its (nonzero) digits is 540000, while the sum is 42.

Adding to 20413321555506 its reverse (60555512331402), we get a palindrome (80968833886908).

The spelling of 20413321555506 in words is "twenty trillion, four hundred thirteen billion, three hundred twenty-one million, five hundred fifty-five thousand, five hundred six".