20815285112683 has 4 divisors (see below), whose sum is σ = 20816741454208. Its totient is φ = 20813828771160.

The previous prime is 20815285112681. The next prime is 20815285112689. The reversal of 20815285112683 is 38621158251802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20815285112683 - 2¹ = 20815285112681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20815285112683.

It is not an unprimeable number, because it can be changed into a prime (20815285112681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728149323 + ... + 728177908.

It is an arithmetic number, because the mean of its divisors is an integer number (5204185363552).

Almost surely, 2^{20815285112683} is an apocalyptic number.

20815285112683 is a deficient number, since it is larger than the sum of its proper divisors (1456341525).

20815285112683 is a wasteful number, since it uses less digits than its factorization.

20815285112683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456341524.

The product of its (nonzero) digits is 1843200, while the sum is 52.

The spelling of 20815285112683 in words is "twenty trillion, eight hundred fifteen billion, two hundred eighty-five million, one hundred twelve thousand, six hundred eighty-three".