20380433 has 4 divisors (see below), whose sum is σ = 21579300. Its totient is φ = 19181568.

The previous prime is 20380427. The next prime is 20380439. The reversal of 20380433 is 33408302.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20380427) and next prime (20380439).

It can be written as a sum of positive squares in 2 ways, for example, as 6190144 + 14190289 = 2488^2 + 3767^2 .

It is a cyclic number.

It is not a de Polignac number, because 20380433 - 2⁸ = 20380177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20380399 and 20380408.

It is not an unprimeable number, because it can be changed into a prime (20380439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599408 + ... + 599441.

It is an arithmetic number, because the mean of its divisors is an integer number (5394825).

Almost surely, 2^20380433 is an apocalyptic number.

It is an amenable number.

20380433 is a deficient number, since it is larger than the sum of its proper divisors (1198867).

20380433 is a wasteful number, since it uses less digits than its factorization.

20380433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198866.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20380433 is about 4514.4692932835. The cubic root of 20380433 is about 273.1520529419.

Adding to 20380433 its reverse (33408302), we get a palindrome (53788735).

The spelling of 20380433 in words is "twenty million, three hundred eighty thousand, four hundred thirty-three".