20353427665 has 16 divisors (see below), whose sum is σ = 26336661120. Its totient is φ = 15049514880.

The previous prime is 20353427663. The next prime is 20353427693. The reversal of 20353427665 is 56672435302.

It is not a de Polignac number, because 20353427665 - 2¹ = 20353427663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20353427663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2608869 + ... + 2616658.

It is an arithmetic number, because the mean of its divisors is an integer number (1646041320).

Almost surely, 2^20353427665 is an apocalyptic number.

It is an amenable number.

20353427665 is a deficient number, since it is larger than the sum of its proper divisors (5983233455).

20353427665 is a wasteful number, since it uses less digits than its factorization.

20353427665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5225592.

The product of its (nonzero) digits is 907200, while the sum is 43.

The spelling of 20353427665 in words is "twenty billion, three hundred fifty-three million, four hundred twenty-seven thousand, six hundred sixty-five".