20393495247 has 4 divisors (see below), whose sum is σ = 27191327000. Its totient is φ = 13595663496.

The previous prime is 20393495231. The next prime is 20393495257. The reversal of 20393495247 is 74259439302.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20393495247 - 2⁴ = 20393495231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20393495196 and 20393495205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20393495257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3398915872 + ... + 3398915877.

It is an arithmetic number, because the mean of its divisors is an integer number (6797831750).

Almost surely, 2^20393495247 is an apocalyptic number.

20393495247 is a deficient number, since it is larger than the sum of its proper divisors (6797831753).

20393495247 is an equidigital number, since it uses as much as digits as its factorization.

20393495247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6797831752.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 20393495247 in words is "twenty billion, three hundred ninety-three million, four hundred ninety-five thousand, two hundred forty-seven".