20531313206 has 16 divisors (see below), whose sum is σ = 31816745088. Its totient is φ = 9926280000.

The previous prime is 20531313191. The next prime is 20531313221. The reversal of 20531313206 is 60231313502.

It is an interprime number because it is at equal distance from previous prime (20531313191) and next prime (20531313221).

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 61295 + ... + 211706.

It is an arithmetic number, because the mean of its divisors is an integer number (1988546568).

Almost surely, 2^20531313206 is an apocalyptic number.

20531313206 is a deficient number, since it is larger than the sum of its proper divisors (11285431882).

20531313206 is a wasteful number, since it uses less digits than its factorization.

20531313206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274247.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 20531313206 its reverse (60231313502), we get a palindrome (80762626708).

The spelling of 20531313206 in words is "twenty billion, five hundred thirty-one million, three hundred thirteen thousand, two hundred six".