20351660233646 has 16 divisors (see below), whose sum is σ = 34888859402976. Its totient is φ = 8722065349536.

The previous prime is 20351660233631. The next prime is 20351660233657. The reversal of 20351660233646 is 64633206615302.

It is a self number, because there is not a number n which added to its sum of digits gives 20351660233646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4521161 + ... + 7819476.

It is an arithmetic number, because the mean of its divisors is an integer number (2180553712686).

Almost surely, 2^{20351660233646} is an apocalyptic number.

20351660233646 is a deficient number, since it is larger than the sum of its proper divisors (14537199169330).

20351660233646 is a wasteful number, since it uses less digits than its factorization.

20351660233646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12458443.

The product of its (nonzero) digits is 2799360, while the sum is 47.

Adding to 20351660233646 its reverse (64633206615302), we get a palindrome (84984866848948).

The spelling of 20351660233646 in words is "twenty trillion, three hundred fifty-one billion, six hundred sixty million, two hundred thirty-three thousand, six hundred forty-six".