20585081280 has 336 divisors, whose sum is σ = 68971619232. Its totient is φ = 5199667200.

The previous prime is 20585081267. The next prime is 20585081287. The reversal of 20585081280 is 8218058502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20585081287) 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, 48895470 + ... + 48895890.

Almost surely, 2^20585081280 is an apocalyptic number.

20585081280 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 20585081280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34485809616).

20585081280 is an abundant number, since it is smaller than the sum of its proper divisors (48386537952).

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

20585081280 is a wasteful number, since it uses less digits than its factorization.

20585081280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 39.

The spelling of 20585081280 in words is "twenty billion, five hundred eighty-five million, eighty-one thousand, two hundred eighty".