20728211006577 has 8 divisors (see below), whose sum is σ = 27640957024960. Its totient is φ = 13817136162960.

The previous prime is 20728211006563. The next prime is 20728211006623. The reversal of 20728211006577 is 77560011282702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20728211006577 - 2⁴ = 20728211006561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20728211006177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417764749 + ... + 417814362.

It is an arithmetic number, because the mean of its divisors is an integer number (3455119628120).

Almost surely, 2^{20728211006577} is an apocalyptic number.

It is an amenable number.

20728211006577 is a deficient number, since it is larger than the sum of its proper divisors (6912746018383).

20728211006577 is an equidigital number, since it uses as much as digits as its factorization.

20728211006577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835587383.

The product of its (nonzero) digits is 658560, while the sum is 48.

The spelling of 20728211006577 in words is "twenty trillion, seven hundred twenty-eight billion, two hundred eleven million, six thousand, five hundred seventy-seven".