20557404274705 has 16 divisors (see below), whose sum is σ = 24786297500544. Its totient is φ = 16367820733440.

The previous prime is 20557404274699. The next prime is 20557404274727. The reversal of 20557404274705 is 50747240475502.

It is not a de Polignac number, because 20557404274705 - 2⁷ = 20557404274577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9808837 + ... + 11718706.

It is an arithmetic number, because the mean of its divisors is an integer number (1549143593784).

Almost surely, 2^{20557404274705} is an apocalyptic number.

It is an amenable number.

20557404274705 is a deficient number, since it is larger than the sum of its proper divisors (4228893225839).

20557404274705 is a wasteful number, since it uses less digits than its factorization.

20557404274705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21528456.

The product of its (nonzero) digits is 10976000, while the sum is 52.

The spelling of 20557404274705 in words is "twenty trillion, five hundred fifty-seven billion, four hundred four million, two hundred seventy-four thousand, seven hundred five".