20353451561 has 8 divisors (see below), whose sum is σ = 20464709760. Its totient is φ = 20242273968.

The previous prime is 20353451539. The next prime is 20353451579. The reversal of 20353451561 is 16515435302.

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 20353451561 - 2¹⁴ = 20353435177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20353451861) 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, 526430 + ... + 563768.

It is an arithmetic number, because the mean of its divisors is an integer number (2558088720).

Almost surely, 2^20353451561 is an apocalyptic number.

It is an amenable number.

20353451561 is a deficient number, since it is larger than the sum of its proper divisors (111258199).

20353451561 is a wasteful number, since it uses less digits than its factorization.

20353451561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40303.

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 20353451561 its reverse (16515435302), we get a palindrome (36868886863).

The spelling of 20353451561 in words is "twenty billion, three hundred fifty-three million, four hundred fifty-one thousand, five hundred sixty-one".