20328421305 has 16 divisors (see below), whose sum is σ = 33647042880. Its totient is φ = 10467968448.

The previous prime is 20328421261. The next prime is 20328421343. The reversal of 20328421305 is 50312482302.

It is not a de Polignac number, because 20328421305 - 2¹⁷ = 20328290233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23365567 + ... + 23366436.

It is an arithmetic number, because the mean of its divisors is an integer number (2102940180).

Almost surely, 2^20328421305 is an apocalyptic number.

It is an amenable number.

20328421305 is a deficient number, since it is larger than the sum of its proper divisors (13318621575).

20328421305 is a wasteful number, since it uses less digits than its factorization.

20328421305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46732040.

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 20328421305 in words is "twenty billion, three hundred twenty-eight million, four hundred twenty-one thousand, three hundred five".