20001436 has 24 divisors (see below), whose sum is σ = 43080800. Its totient is φ = 7912512.

The previous prime is 20001389. The next prime is 20001439. The reversal of 20001436 is 63410002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001439) 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 7 ways as a sum of consecutive naturals, for example, 27111 + ... + 27838.

Almost surely, 2^20001436 is an apocalyptic number.

20001436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20001436 is an abundant number, since it is smaller than the sum of its proper divisors (23079364).

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

20001436 is a wasteful number, since it uses less digits than its factorization.

20001436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54973 (or 54971 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20001436 is about 4472.2965017986. The cubic root of 20001436 is about 271.4482580102.

Adding to 20001436 its reverse (63410002), we get a palindrome (83411438).

The spelling of 20001436 in words is "twenty million, one thousand, four hundred thirty-six".