20609321447 has 32 divisors (see below), whose sum is σ = 25147100160. Its totient is φ = 16639355520.

The previous prime is 20609321431. The next prime is 20609321449. The reversal of 20609321447 is 74412390602.

It is a cyclic number.

It is not a de Polignac number, because 20609321447 - 2⁴ = 20609321431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20609321447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609321449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 370553 + ... + 422525.

It is an arithmetic number, because the mean of its divisors is an integer number (785846880).

Almost surely, 2^20609321447 is an apocalyptic number.

20609321447 is a deficient number, since it is larger than the sum of its proper divisors (4537778713).

20609321447 is a wasteful number, since it uses less digits than its factorization.

20609321447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52103.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 20609321447 in words is "twenty billion, six hundred nine million, three hundred twenty-one thousand, four hundred forty-seven".