20432240 has 40 divisors (see below), whose sum is σ = 49148640. Its totient is φ = 7890176.

The previous prime is 20432233. The next prime is 20432261. The reversal of 20432240 is 4223402.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2084 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (1228716).

Almost surely, 2^20432240 is an apocalyptic number.

20432240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20432240 is an abundant number, since it is smaller than the sum of its proper divisors (28716400).

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

20432240 is a wasteful number, since it uses less digits than its factorization.

20432240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8849 (or 8843 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 20432240 is about 4520.2035352404. The cubic root of 20432240 is about 273.3833076713.

Adding to 20432240 its reverse (4223402), we get a palindrome (24655642).

The spelling of 20432240 in words is "twenty million, four hundred thirty-two thousand, two hundred forty".