20505340300123 has 8 divisors (see below), whose sum is σ = 23463642094560. Its totient is φ = 17554280372160.

The previous prime is 20505340300117. The next prime is 20505340300177. The reversal of 20505340300123 is 32100304350502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20505340300123 - 2²¹ = 20505338202971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20505340300091 and 20505340300100.

It is not an unprimeable number, because it can be changed into a prime (20505340300103) 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, 1810460548 + ... + 1810471873.

It is an arithmetic number, because the mean of its divisors is an integer number (2932955261820).

Almost surely, 2^{20505340300123} is an apocalyptic number.

20505340300123 is a deficient number, since it is larger than the sum of its proper divisors (2958301794437).

20505340300123 is an equidigital number, since it uses as much as digits as its factorization.

20505340300123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3620933237.

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 20505340300123 its reverse (32100304350502), we get a palindrome (52605644650625).

The spelling of 20505340300123 in words is "twenty trillion, five hundred five billion, three hundred forty million, three hundred thousand, one hundred twenty-three".