20409432 has 16 divisors (see below), whose sum is σ = 51023640. Its totient is φ = 6803136.

The previous prime is 20409383. The next prime is 20409437. The reversal of 20409432 is 23490402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 850393 = 20409432 / (2 + 0 + 4 + 0 + 9 + 4 + 3 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20409437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425173 + ... + 425220.

Almost surely, 2^20409432 is an apocalyptic number.

It is an amenable number.

20409432 is an abundant number, since it is smaller than the sum of its proper divisors (30614208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20409432 is a wasteful number, since it uses less digits than its factorization.

20409432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850402 (or 850398 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20409432 is about 4517.6799355421. The cubic root of 20409432 is about 273.2815461409.

Adding to 20409432 its reverse (23490402), we get a palindrome (43899834).

The spelling of 20409432 in words is "twenty million, four hundred nine thousand, four hundred thirty-two".