20571065528448 has 256 divisors, whose sum is σ = 61470390412800. Its totient is φ = 6056856797184.

The previous prime is 20571065528383. The next prime is 20571065528471. The reversal of 20571065528448 is 84482556017502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12496411 + ... + 14046437.

It is an arithmetic number, because the mean of its divisors is an integer number (240118712550).

Almost surely, 2^{20571065528448} 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 20571065528448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30735195206400).

20571065528448 is an abundant number, since it is smaller than the sum of its proper divisors (40899324884352).

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

20571065528448 is a wasteful number, since it uses less digits than its factorization.

20571065528448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550187 (or 1550175 counting only the distinct ones).

The product of its (nonzero) digits is 21504000, while the sum is 57.

The spelling of 20571065528448 in words is "twenty trillion, five hundred seventy-one billion, sixty-five million, five hundred twenty-eight thousand, four hundred forty-eight".