20312456203505 has 8 divisors (see below), whose sum is σ = 24375006252072. Its totient is φ = 16249925757568.

The previous prime is 20312456203499. The next prime is 20312456203553. The reversal of 20312456203505 is 50530265421302.

It can be written as a sum of positive squares in 4 ways, for example, as 3221045004529 + 17091411198976 = 1794727^2 + 4134176^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20312456203505 - 2⁶ = 20312456203441 is a prime.

It is a Duffinian 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, 2515454 + ... + 6852183.

It is an arithmetic number, because the mean of its divisors is an integer number (3046875781509).

Almost surely, 2^{20312456203505} is an apocalyptic number.

It is an amenable number.

20312456203505 is a deficient number, since it is larger than the sum of its proper divisors (4062550048567).

20312456203505 is an equidigital number, since it uses as much as digits as its factorization.

20312456203505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9801315.

The product of its (nonzero) digits is 216000, while the sum is 38.

The spelling of 20312456203505 in words is "twenty trillion, three hundred twelve billion, four hundred fifty-six million, two hundred three thousand, five hundred five".