20430936 has 24 divisors (see below), whose sum is σ = 55333980. Its totient is φ = 6810288.

The previous prime is 20430931. The next prime is 20430937. The reversal of 20430936 is 63903402.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430931) 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 5 ways as a sum of consecutive naturals, for example, 141810 + ... + 141953.

Almost surely, 2^20430936 is an apocalyptic number.

It is an amenable number.

20430936 is an abundant number, since it is smaller than the sum of its proper divisors (34903044).

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

20430936 is a wasteful number, since it uses less digits than its factorization.

20430936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283775 (or 283768 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 20430936 is about 4520.0592916465. The cubic root of 20430936 is about 273.3774917089.

The spelling of 20430936 in words is "twenty million, four hundred thirty thousand, nine hundred thirty-six".