20645534657367 has 6 divisors (see below), whose sum is σ = 29821327838432. Its totient is φ = 13763689771572.

The previous prime is 20645534657359. The next prime is 20645534657443. The reversal of 20645534657367 is 76375643554602.

20645534657367 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 5 + 53 + 4 + 6 + 573 + 6 + 7 = 666.

It is not a de Polignac number, because 20645534657367 - 2³ = 20645534657359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645534657767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1146974147623 + ... + 1146974147640.

Almost surely, 2^{20645534657367} is an apocalyptic number.

20645534657367 is a deficient number, since it is larger than the sum of its proper divisors (9175793181065).

20645534657367 is a wasteful number, since it uses less digits than its factorization.

20645534657367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293948295269 (or 2293948295266 counting only the distinct ones).

The product of its (nonzero) digits is 381024000, while the sum is 63.

The spelling of 20645534657367 in words is "twenty trillion, six hundred forty-five billion, five hundred thirty-four million, six hundred fifty-seven thousand, three hundred sixty-seven".