20231021205 has 48 divisors (see below), whose sum is σ = 35597802240. Its totient is φ = 10627524864.

The previous prime is 20231021189. The next prime is 20231021219. The reversal of 20231021205 is 50212013202.

It is not a de Polignac number, because 20231021205 - 2⁴ = 20231021189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1043712 + ... + 1062918.

It is an arithmetic number, because the mean of its divisors is an integer number (741620880).

Almost surely, 2^20231021205 is an apocalyptic number.

It is an amenable number.

20231021205 is a deficient number, since it is larger than the sum of its proper divisors (15366781035).

20231021205 is a wasteful number, since it uses less digits than its factorization.

20231021205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19570 (or 19567 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 20231021205 its reverse (50212013202), we get a palindrome (70443034407).

The spelling of 20231021205 in words is "twenty billion, two hundred thirty-one million, twenty-one thousand, two hundred five".