20436407136 has 192 divisors, whose sum is σ = 61556060160. Its totient is φ = 6591352320.

The previous prime is 20436407129. The next prime is 20436407137. The reversal of 20436407136 is 63170463402.

It is a happy number.

20436407136 is a `hidden beast` number, since 2 + 0 + 4 + 3 + 640 + 7 + 1 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20436407136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20436407137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6104215 + ... + 6107561.

It is an arithmetic number, because the mean of its divisors is an integer number (320604480).

Almost surely, 2^20436407136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20436407136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30778030080).

20436407136 is an abundant number, since it is smaller than the sum of its proper divisors (41119653024).

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

20436407136 is a wasteful number, since it uses less digits than its factorization.

20436407136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594 (or 3580 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The spelling of 20436407136 in words is "twenty billion, four hundred thirty-six million, four hundred seven thousand, one hundred thirty-six".