20405433 has 8 divisors (see below), whose sum is σ = 27471808. Its totient is φ = 13471344.

The previous prime is 20405387. The next prime is 20405443. The reversal of 20405433 is 33450402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20405433 - 2¹⁴ = 20389049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20405443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32710 + ... + 33327.

It is an arithmetic number, because the mean of its divisors is an integer number (3433976).

Almost surely, 2^20405433 is an apocalyptic number.

It is an amenable number.

20405433 is a deficient number, since it is larger than the sum of its proper divisors (7066375).

20405433 is a wasteful number, since it uses less digits than its factorization.

20405433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66143.

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

The square root of 20405433 is about 4517.2373194243. The cubic root of 20405433 is about 273.2636961539.

Adding to 20405433 its reverse (33450402), we get a palindrome (53855835).

The spelling of 20405433 in words is "twenty million, four hundred five thousand, four hundred thirty-three".