20645473443667 has 8 divisors (see below), whose sum is σ = 20808451141632. Its totient is φ = 20482502229000.

The previous prime is 20645473443653. The next prime is 20645473443677. The reversal of 20645473443667 is 76634437454602.

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 20645473443667 - 2¹⁵ = 20645473410899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20645473443677) 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, 4875492 + ... + 8066062.

It is an arithmetic number, because the mean of its divisors is an integer number (2601056392704).

Almost surely, 2^{20645473443667} is an apocalyptic number.

20645473443667 is a deficient number, since it is larger than the sum of its proper divisors (162977697965).

20645473443667 is a wasteful number, since it uses less digits than its factorization.

20645473443667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241649.

The product of its (nonzero) digits is 243855360, while the sum is 61.

The spelling of 20645473443667 in words is "twenty trillion, six hundred forty-five billion, four hundred seventy-three million, four hundred forty-three thousand, six hundred sixty-seven".