20446528638 has 64 divisors (see below), whose sum is σ = 43933317120. Its totient is φ = 6328209888.

The previous prime is 20446528637. The next prime is 20446528651. The reversal of 20446528638 is 83682564402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20446528633) 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, 956673 + ... + 977811.

It is an arithmetic number, because the mean of its divisors is an integer number (686458080).

Almost surely, 2^20446528638 is an apocalyptic number.

20446528638 is an abundant number, since it is smaller than the sum of its proper divisors (23486788482).

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

20446528638 is a wasteful number, since it uses less digits than its factorization.

20446528638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21373.

The product of its (nonzero) digits is 2211840, while the sum is 48.

The spelling of 20446528638 in words is "twenty billion, four hundred forty-six million, five hundred twenty-eight thousand, six hundred thirty-eight".