20443136 has 104 divisors (see below), whose sum is σ = 50325504. Its totient is φ = 8110080.

The previous prime is 20443123. The next prime is 20443141. The reversal of 20443136 is 63134402.

20443136 = T₁₈₃ + T₁₈₄ + ... + T₅₀₄.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 659441 + ... + 659471.

Almost surely, 2^20443136 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 20443136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25162752).

20443136 is an abundant number, since it is smaller than the sum of its proper divisors (29882368).

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

20443136 is an equidigital number, since it uses as much as digits as its factorization.

20443136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20443136 is about 4521.4086300621. The cubic root of 20443136 is about 273.4318951842.

Adding to 20443136 its reverse (63134402), we get a palindrome (83577538).

The spelling of 20443136 in words is "twenty million, four hundred forty-three thousand, one hundred thirty-six".