20644046363 has 16 divisors (see below), whose sum is σ = 21716135424. Its totient is φ = 19601508960.

The previous prime is 20644046347. The next prime is 20644046413. The reversal of 20644046363 is 36364044602.

It is a cyclic number.

It is not a de Polignac number, because 20644046363 - 2⁴ = 20644046347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20644046303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 586328 + ... + 620538.

It is an arithmetic number, because the mean of its divisors is an integer number (1357258464).

Almost surely, 2^20644046363 is an apocalyptic number.

20644046363 is a deficient number, since it is larger than the sum of its proper divisors (1072089061).

20644046363 is a wasteful number, since it uses less digits than its factorization.

20644046363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34642.

The product of its (nonzero) digits is 248832, while the sum is 38.

The spelling of 20644046363 in words is "twenty billion, six hundred forty-four million, forty-six thousand, three hundred sixty-three".