20345320623663 has 80 divisors (see below), whose sum is σ = 35178233896960. Its totient is φ = 11477299017600.

The previous prime is 20345320623599. The next prime is 20345320623697. The reversal of 20345320623663 is 36632602354302.

20345320623663 is a `hidden beast` number, since 2 + 0 + 34 + 5 + 320 + 6 + 236 + 63 = 666.

It is not a de Polignac number, because 20345320623663 - 2⁶ = 20345320623599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345320621663) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 431377803 + ... + 431424963.

It is an arithmetic number, because the mean of its divisors is an integer number (439727923712).

Almost surely, 2^{20345320623663} is an apocalyptic number.

20345320623663 is a deficient number, since it is larger than the sum of its proper divisors (14832913273297).

20345320623663 is an equidigital number, since it uses as much as digits as its factorization.

20345320623663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56890 (or 56881 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 45.

Adding to 20345320623663 its reverse (36632602354302), we get a palindrome (56977922977965).

The spelling of 20345320623663 in words is "twenty trillion, three hundred forty-five billion, three hundred twenty million, six hundred twenty-three thousand, six hundred sixty-three".