20440667520 has 960 divisors, whose sum is σ = 91594918800. Its totient is φ = 4305788928.

The previous prime is 20440667497. The next prime is 20440667521. The reversal of 20440667520 is 2576604402.

It is a tau number, because it is divible by the number of its divisors (960).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440667521) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 33021771 + ... + 33022389.

Almost surely, 2^20440667520 is an apocalyptic number.

20440667520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20440667520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45797459400).

20440667520 is an abundant number, since it is smaller than the sum of its proper divisors (71154251280).

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

20440667520 is a wasteful number, since it uses less digits than its factorization.

20440667520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The spelling of 20440667520 in words is "twenty billion, four hundred forty million, six hundred sixty-seven thousand, five hundred twenty".