20440533 has 4 divisors (see below), whose sum is σ = 27254048. Its totient is φ = 13627020.

The previous prime is 20440517. The next prime is 20440549. The reversal of 20440533 is 33504402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20440517) and next prime (20440549).

It is not a de Polignac number, because 20440533 - 2⁴ = 20440517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440513) 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, 3406753 + ... + 3406758.

It is an arithmetic number, because the mean of its divisors is an integer number (6813512).

Almost surely, 2^20440533 is an apocalyptic number.

It is an amenable number.

20440533 is a deficient number, since it is larger than the sum of its proper divisors (6813515).

20440533 is an equidigital number, since it uses as much as digits as its factorization.

20440533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813514.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20440533 is about 4521.1207681282. The cubic root of 20440533 is about 273.4202894398.

Adding to 20440533 its reverse (33504402), we get a palindrome (53944935).

The spelling of 20440533 in words is "twenty million, four hundred forty thousand, five hundred thirty-three".