20847944429 has 8 divisors (see below), whose sum is σ = 22454063520. Its totient is φ = 19242172656.

The previous prime is 20847944417. The next prime is 20847944477. The reversal of 20847944429 is 92444974802.

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 20847944429 - 2¹⁶ = 20847878893 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 (20847944129) 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, 45302 + ... + 209160.

It is an arithmetic number, because the mean of its divisors is an integer number (2806757940).

Almost surely, 2^20847944429 is an apocalyptic number.

It is an amenable number.

20847944429 is a deficient number, since it is larger than the sum of its proper divisors (1606119091).

20847944429 is a wasteful number, since it uses less digits than its factorization.

20847944429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173659.

The product of its (nonzero) digits is 4644864, while the sum is 53.

The spelling of 20847944429 in words is "twenty billion, eight hundred forty-seven million, nine hundred forty-four thousand, four hundred twenty-nine".