20842127257 has 8 divisors (see below), whose sum is σ = 23824543232. Its totient is φ = 17860953600.

The previous prime is 20842127231. The next prime is 20842127287. The reversal of 20842127257 is 75272124802.

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

It is not a de Polignac number, because 20842127257 - 2¹¹ = 20842125209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20842127287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274344 + ... + 341977.

It is an arithmetic number, because the mean of its divisors is an integer number (2978067904).

Almost surely, 2^20842127257 is an apocalyptic number.

It is an amenable number.

20842127257 is a deficient number, since it is larger than the sum of its proper divisors (2982415975).

20842127257 is an equidigital number, since it uses as much as digits as its factorization.

20842127257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621159.

The product of its (nonzero) digits is 125440, while the sum is 40.

The spelling of 20842127257 in words is "twenty billion, eight hundred forty-two million, one hundred twenty-seven thousand, two hundred fifty-seven".