20203121205 has 24 divisors (see below), whose sum is σ = 35498458008. Its totient is φ = 10627393536.

The previous prime is 20203121153. The next prime is 20203121207. The reversal of 20203121205 is 50212130202.

It can be written as a sum of positive squares in 4 ways, for example, as 4761828036 + 15441293169 = 69006^2 + 124263^2 .

It is not a de Polignac number, because 20203121205 - 2⁷ = 20203121077 is a prime.

It is a super-2 number, since 2×20203121205² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203121207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3071772 + ... + 3078341.

It is an arithmetic number, because the mean of its divisors is an integer number (1479102417).

Almost surely, 2^20203121205 is an apocalyptic number.

It is an amenable number.

20203121205 is a deficient number, since it is larger than the sum of its proper divisors (15295336803).

20203121205 is a wasteful number, since it uses less digits than its factorization.

20203121205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6150197 (or 6150194 counting only the distinct ones).

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

Adding to 20203121205 its reverse (50212130202), we get a palindrome (70415251407).

The spelling of 20203121205 in words is "twenty billion, two hundred three million, one hundred twenty-one thousand, two hundred five".