20283728391 has 12 divisors (see below), whose sum is σ = 29323293168. Its totient is φ = 13511143584.

The previous prime is 20283728371. The next prime is 20283728401. The reversal of 20283728391 is 19382738202.

20283728391 is a `hidden beast` number, since 2 + 0 + 283 + 7 + 283 + 91 = 666.

It is not a de Polignac number, because 20283728391 - 2¹⁵ = 20283695623 is a prime.

It is a super-2 number, since 2×20283728391² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20283728371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 933835 + ... + 955308.

It is an arithmetic number, because the mean of its divisors is an integer number (2443607764).

Almost surely, 2^20283728391 is an apocalyptic number.

20283728391 is a deficient number, since it is larger than the sum of its proper divisors (9039564777).

20283728391 is a wasteful number, since it uses less digits than its factorization.

20283728391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890342 (or 1890339 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 20283728391 in words is "twenty billion, two hundred eighty-three million, seven hundred twenty-eight thousand, three hundred ninety-one".