20601521280 has 192 divisors, whose sum is σ = 72654192000. Its totient is φ = 5376780288.

The previous prime is 20601521257. The next prime is 20601521287. The reversal of 20601521280 is 8212510602.

It is a happy number.

20601521280 is a `hidden beast` number, since 2 + 0 + 60 + 1 + 521 + 2 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is not an unprimeable number, because it can be changed into a prime (20601521287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232671 + ... + 308769.

It is an arithmetic number, because the mean of its divisors is an integer number (378407250).

Almost surely, 2^20601521280 is an apocalyptic number.

20601521280 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 20601521280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36327096000).

20601521280 is an abundant number, since it is smaller than the sum of its proper divisors (52052670720).

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

20601521280 is a wasteful number, since it uses less digits than its factorization.

20601521280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76171 (or 76156 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 20601521280 in words is "twenty billion, six hundred one million, five hundred twenty-one thousand, two hundred eighty".