20645646341 has 16 divisors (see below), whose sum is σ = 21419971776. Its totient is φ = 19888592256.

The previous prime is 20645646323. The next prime is 20645646353. The reversal of 20645646341 is 14364654602.

It is a cyclic number.

It is not a de Polignac number, because 20645646341 - 2¹⁸ = 20645384197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645648341) 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, 702641 + ... + 731433.

It is an arithmetic number, because the mean of its divisors is an integer number (1338748236).

Almost surely, 2^20645646341 is an apocalyptic number.

It is an amenable number.

20645646341 is a deficient number, since it is larger than the sum of its proper divisors (774325435).

20645646341 is a wasteful number, since it uses less digits than its factorization.

20645646341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29092.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 20645646341 in words is "twenty billion, six hundred forty-five million, six hundred forty-six thousand, three hundred forty-one".