20944636747 has 4 divisors (see below), whose sum is σ = 20972526496. Its totient is φ = 20916747000.

The previous prime is 20944636729. The next prime is 20944636781. The reversal of 20944636747 is 74763644902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74763644902 = 2 ⋅37381822451.

It is a cyclic number.

It is not a de Polignac number, because 20944636747 - 2¹¹ = 20944634699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20944636694 and 20944636703.

It is not an unprimeable number, because it can be changed into a prime (20944636787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13943748 + ... + 13945249.

It is an arithmetic number, because the mean of its divisors is an integer number (5243131624).

Almost surely, 2^20944636747 is an apocalyptic number.

20944636747 is a deficient number, since it is larger than the sum of its proper divisors (27889749).

20944636747 is an equidigital number, since it uses as much as digits as its factorization.

20944636747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27889748.

The product of its (nonzero) digits is 6096384, while the sum is 52.

The spelling of 20944636747 in words is "twenty billion, nine hundred forty-four million, six hundred thirty-six thousand, seven hundred forty-seven".