20531220315 has 16 divisors (see below), whose sum is σ = 33406732800. Its totient is φ = 10764390752.

The previous prime is 20531220301. The next prime is 20531220323. The reversal of 20531220315 is 51302213502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20531220315 - 2⁷ = 20531220187 is a prime.

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, 11598675 + ... + 11600444.

It is an arithmetic number, because the mean of its divisors is an integer number (2087920800).

Almost surely, 2^20531220315 is an apocalyptic number.

20531220315 is a deficient number, since it is larger than the sum of its proper divisors (12875512485).

20531220315 is a wasteful number, since it uses less digits than its factorization.

20531220315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23199186.

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 20531220315 its reverse (51302213502), we get a palindrome (71833433817).

The spelling of 20531220315 in words is "twenty billion, five hundred thirty-one million, two hundred twenty thousand, three hundred fifteen".