20531345106 has 32 divisors (see below), whose sum is σ = 42027321600. Its totient is φ = 6683083344.

The previous prime is 20531345089. The next prime is 20531345137. The reversal of 20531345106 is 60154313502.

It is a super-2 number, since 2×20531345106² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 1811445 + ... + 1822743.

It is an arithmetic number, because the mean of its divisors is an integer number (1313353800).

Almost surely, 2^20531345106 is an apocalyptic number.

20531345106 is an abundant number, since it is smaller than the sum of its proper divisors (21495976494).

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

20531345106 is a wasteful number, since it uses less digits than its factorization.

20531345106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18390.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 20531345106 its reverse (60154313502), we get a palindrome (80685658608).

The spelling of 20531345106 in words is "twenty billion, five hundred thirty-one million, three hundred forty-five thousand, one hundred six".