20928729301057 has 8 divisors (see below), whose sum is σ = 21494678656616. Its totient is φ = 20362796157312.

The previous prime is 20928729300959. The next prime is 20928729301097. The reversal of 20928729301057 is 75010392782902.

It can be written as a sum of positive squares in 4 ways, for example, as 3731526704656 + 17197202596401 = 1931716^2 + 4146951^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20928729301057 - 2¹⁵ = 20928729268289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20928729300989 and 20928729301007.

It is not an unprimeable number, because it can be changed into a prime (20928729301097) 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, 1413198 + ... + 6622279.

It is an arithmetic number, because the mean of its divisors is an integer number (2686834832077).

Almost surely, 2^{20928729301057} is an apocalyptic number.

It is an amenable number.

20928729301057 is a deficient number, since it is larger than the sum of its proper divisors (565949355559).

20928729301057 is an equidigital number, since it uses as much as digits as its factorization.

20928729301057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8105907.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 20928729301057 in words is "twenty trillion, nine hundred twenty-eight billion, seven hundred twenty-nine million, three hundred one thousand, fifty-seven".