20531045105 has 16 divisors (see below), whose sum is σ = 25958050560. Its totient is φ = 15558172608.

The previous prime is 20531045083. The next prime is 20531045173. The reversal of 20531045105 is 50154013502.

It is a cyclic number.

It is not a de Polignac number, because 20531045105 - 2¹⁰ = 20531044081 is a prime.

It is a super-2 number, since 2×20531045105² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 854810 + ... + 878499.

It is an arithmetic number, because the mean of its divisors is an integer number (1622378160).

Almost surely, 2^20531045105 is an apocalyptic number.

It is an amenable number.

20531045105 is a deficient number, since it is larger than the sum of its proper divisors (5427005455).

20531045105 is a wasteful number, since it uses less digits than its factorization.

20531045105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733440.

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 20531045105 its reverse (50154013502), we get a palindrome (70685058607).

The spelling of 20531045105 in words is "twenty billion, five hundred thirty-one million, forty-five thousand, one hundred five".