20436006520 has 32 divisors (see below), whose sum is σ = 47566569600. Its totient is φ = 7892526208.

The previous prime is 20436006497. The next prime is 20436006571. The reversal of 20436006520 is 2560063402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8807464 + ... + 8809783.

It is an arithmetic number, because the mean of its divisors is an integer number (1486455300).

Almost surely, 2^20436006520 is an apocalyptic number.

20436006520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20436006520 is an abundant number, since it is smaller than the sum of its proper divisors (27130563080).

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

20436006520 is a wasteful number, since it uses less digits than its factorization.

20436006520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17617287 (or 17617283 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 20436006520 its reverse (2560063402), we get a palindrome (22996069922).

The spelling of 20436006520 in words is "twenty billion, four hundred thirty-six million, six thousand, five hundred twenty".