20440356516 has 144 divisors (see below), whose sum is σ = 54143316864. Its totient is φ = 6495717888.

The previous prime is 20440356511. The next prime is 20440356523. The reversal of 20440356516 is 61565304402.

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

It is not an unprimeable number, because it can be changed into a prime (20440356511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20793361 + ... + 20794343.

It is an arithmetic number, because the mean of its divisors is an integer number (375995256).

Almost surely, 2^20440356516 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 20440356516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27071658432).

20440356516 is an abundant number, since it is smaller than the sum of its proper divisors (33702960348).

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

20440356516 is a wasteful number, since it uses less digits than its factorization.

20440356516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 20440356516 in words is "twenty billion, four hundred forty million, three hundred fifty-six thousand, five hundred sixteen".