20138562444 has 192 divisors, whose sum is σ = 64435617792. Its totient is φ = 4725561600.

The previous prime is 20138562439. The next prime is 20138562463. The reversal of 20138562444 is 44426583102.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 546729 + ... + 582399.

It is an arithmetic number, because the mean of its divisors is an integer number (335602176).

Almost surely, 2^20138562444 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 20138562444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32217808896).

20138562444 is an abundant number, since it is smaller than the sum of its proper divisors (44297055348).

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

20138562444 is a wasteful number, since it uses less digits than its factorization.

20138562444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35756 (or 35754 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

The spelling of 20138562444 in words is "twenty billion, one hundred thirty-eight million, five hundred sixty-two thousand, four hundred forty-four".