20506212210 has 32 divisors (see below), whose sum is σ = 53688992832. Its totient is φ = 4971202880.

The previous prime is 20506212203. The next prime is 20506212211. The reversal of 20506212210 is 1221260502.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20506212211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31069689 + ... + 31070348.

It is an arithmetic number, because the mean of its divisors is an integer number (1677781026).

Almost surely, 2^20506212210 is an apocalyptic number.

20506212210 is an abundant number, since it is smaller than the sum of its proper divisors (33182780622).

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

20506212210 is a wasteful number, since it uses less digits than its factorization.

20506212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62140058.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 20506212210 its reverse (1221260502), we get a palindrome (21727472712).

The spelling of 20506212210 in words is "twenty billion, five hundred six million, two hundred twelve thousand, two hundred ten".