20312662355566 has 16 divisors (see below), whose sum is σ = 34821857631456. Its totient is φ = 8705389039776.

The previous prime is 20312662355561. The next prime is 20312662355647. The reversal of 20312662355566 is 66555326621302.

It is a super-2 number, since 2×20312662355566² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312662355561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342520 + ... + 6382996.

It is an arithmetic number, because the mean of its divisors is an integer number (2176366101966).

Almost surely, 2^{20312662355566} is an apocalyptic number.

20312662355566 is a deficient number, since it is larger than the sum of its proper divisors (14509195275890).

20312662355566 is a wasteful number, since it uses less digits than its factorization.

20312662355566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6280683.

The product of its (nonzero) digits is 11664000, while the sum is 52.

Adding to 20312662355566 its reverse (66555326621302), we get a palindrome (86867988976868).

The spelling of 20312662355566 in words is "twenty trillion, three hundred twelve billion, six hundred sixty-two million, three hundred fifty-five thousand, five hundred sixty-six".