20303121 has 16 divisors (see below), whose sum is σ = 28093248. Its totient is φ = 13032000.

The previous prime is 20303119. The next prime is 20303123. The reversal of 20303121 is 12130302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20303119) and next prime (20303123).

It is not a de Polignac number, because 20303121 - 2¹ = 20303119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20303097 and 20303106.

It is not an unprimeable number, because it can be changed into a prime (20303123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10306 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (1755828).

Almost surely, 2^20303121 is an apocalyptic number.

It is an amenable number.

20303121 is a deficient number, since it is larger than the sum of its proper divisors (7790127).

20303121 is a wasteful number, since it uses less digits than its factorization.

20303121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20303121 is about 4505.8984675645. The cubic root of 20303121 is about 272.8062197408.

Adding to 20303121 its reverse (12130302), we get a palindrome (32433423).

It can be divided in two parts, 2030 and 3121, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 20303121 in words is "twenty million, three hundred three thousand, one hundred twenty-one".