20440433 has 4 divisors (see below), whose sum is σ = 22012788. Its totient is φ = 18868080.

The previous prime is 20440423. The next prime is 20440487. The reversal of 20440433 is 33404402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33404402 = 2 ⋅16702201.

It can be written as a sum of positive squares in 2 ways, for example, as 8832784 + 11607649 = 2972^2 + 3407^2 .

It is a cyclic number.

It is not a de Polignac number, because 20440433 - 2⁶ = 20440369 is a prime.

It is a super-2 number, since 2×20440433² = 835622602454978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440423) 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, 786158 + ... + 786183.

It is an arithmetic number, because the mean of its divisors is an integer number (5503197).

Almost surely, 2^20440433 is an apocalyptic number.

It is an amenable number.

20440433 is a deficient number, since it is larger than the sum of its proper divisors (1572355).

20440433 is a wasteful number, since it uses less digits than its factorization.

20440433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572354.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 20440433 is about 4521.1097089100. The cubic root of 20440433 is about 273.4198435598.

Adding to 20440433 its reverse (33404402), we get a palindrome (53844835).

The spelling of 20440433 in words is "twenty million, four hundred forty thousand, four hundred thirty-three".