20439571968 has 320 divisors, whose sum is σ = 62975880000. Its totient is φ = 6539968512.

The previous prime is 20439571963. The next prime is 20439572029. The reversal of 20439571968 is 86917593402.

20439571968 is a `hidden beast` number, since 2 + 0 + 4 + 3 + 9 + 571 + 9 + 68 = 666.

It is a super-2 number, since 2×20439571968² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20439571963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45522208 + ... + 45522656.

It is an arithmetic number, because the mean of its divisors is an integer number (196799625).

It is a 1-persistent number, because it is pandigital, but 2⋅20439571968 = 40879143936 is not.

Almost surely, 2^20439571968 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 20439571968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31487940000).

20439571968 is an abundant number, since it is smaller than the sum of its proper divisors (42536308032).

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

20439571968 is an equidigital number, since it uses as much as digits as its factorization.

20439571968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 20439571968 in words is "twenty billion, four hundred thirty-nine million, five hundred seventy-one thousand, nine hundred sixty-eight".