20805453321 has 32 divisors (see below), whose sum is σ = 31213486080. Its totient is φ = 12262377600.

The previous prime is 20805453307. The next prime is 20805453353. The reversal of 20805453321 is 12335450802.

It is not a de Polignac number, because 20805453321 - 2¹⁷ = 20805322249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20805453301) 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, 139785 + ... + 247286.

It is an arithmetic number, because the mean of its divisors is an integer number (975421440).

Almost surely, 2^20805453321 is an apocalyptic number.

It is an amenable number.

20805453321 is a deficient number, since it is larger than the sum of its proper divisors (10408032759).

20805453321 is a wasteful number, since it uses less digits than its factorization.

20805453321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387157.

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 20805453321 in words is "twenty billion, eight hundred five million, four hundred fifty-three thousand, three hundred twenty-one".