20026561057 has 8 divisors (see below), whose sum is σ = 20096024832. Its totient is φ = 19957130400.

The previous prime is 20026561033. The next prime is 20026561091. The reversal of 20026561057 is 75016562002.

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 20026561057 - 2⁷ = 20026560929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20026561157) 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, 2127832 + ... + 2137222.

It is an arithmetic number, because the mean of its divisors is an integer number (2512003104).

Almost surely, 2^20026561057 is an apocalyptic number.

It is an amenable number.

20026561057 is a deficient number, since it is larger than the sum of its proper divisors (69463775).

20026561057 is an equidigital number, since it uses as much as digits as its factorization.

20026561057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16559.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 20026561057 in words is "twenty billion, twenty-six million, five hundred sixty-one thousand, fifty-seven".