20446408136 has 128 divisors (see below), whose sum is σ = 50498380800. Its totient is φ = 7518977280.

The previous prime is 20446408123. The next prime is 20446408139. The reversal of 20446408136 is 63180464402.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a self number, because there is not a number n which added to its sum of digits gives 20446408136.

It is not an unprimeable number, because it can be changed into a prime (20446408139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3309146 + ... + 3315318.

It is an arithmetic number, because the mean of its divisors is an integer number (394518600).

Almost surely, 2^20446408136 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 20446408136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25249190400).

20446408136 is an abundant number, since it is smaller than the sum of its proper divisors (30051972664).

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

20446408136 is a wasteful number, since it uses less digits than its factorization.

20446408136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6499 (or 6495 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

The spelling of 20446408136 in words is "twenty billion, four hundred forty-six million, four hundred eight thousand, one hundred thirty-six".