20440529081280 has 1680 divisors, whose sum is σ = 92688347109600. Its totient is φ = 4228173250560.

The previous prime is 20440529081239. The next prime is 20440529081293. The reversal of 20440529081280 is 8218092504402.

20440529081280 is a `hidden beast` number, since 2 + 0 + 4 + 4 + 0 + 5 + 290 + 81 + 280 = 666.

It is a tau number, because it is divible by the number of its divisors (1680).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 3199328326 + ... + 3199334714.

Almost surely, 2^{20440529081280} is an apocalyptic number.

20440529081280 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 20440529081280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46344173554800).

20440529081280 is an abundant number, since it is smaller than the sum of its proper divisors (72247818028320).

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

20440529081280 is a wasteful number, since it uses less digits than its factorization.

20440529081280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6672 (or 6646 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 20440529081280 in words is "twenty trillion, four hundred forty billion, five hundred twenty-nine million, eighty-one thousand, two hundred eighty".