20133409 has 4 divisors (see below), whose sum is σ = 20229040. Its totient is φ = 20037780.

The previous prime is 20133401. The next prime is 20133413. The reversal of 20133409 is 90433102.

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 a cyclic number.

It is not a de Polignac number, because 20133409 - 2³ = 20133401 is a prime.

It is a super-2 number, since 2×20133409² = 810708315922562, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20133409.

It is not an unprimeable number, because it can be changed into a prime (20133401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47499 + ... + 47920.

It is an arithmetic number, because the mean of its divisors is an integer number (5057260).

Almost surely, 2^20133409 is an apocalyptic number.

It is an amenable number.

20133409 is a deficient number, since it is larger than the sum of its proper divisors (95631).

20133409 is an equidigital number, since it uses as much as digits as its factorization.

20133409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95630.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20133409 is about 4487.0267438472. The cubic root of 20133409 is about 272.0439708686.

The spelling of 20133409 in words is "twenty million, one hundred thirty-three thousand, four hundred nine".