20826857522785 has 8 divisors (see below), whose sum is σ = 25221515532840. Its totient is φ = 16508628347904.

The previous prime is 20826857522759. The next prime is 20826857522819. The reversal of 20826857522785 is 58722575862802.

It can be written as a sum of positive squares in 4 ways, for example, as 4906725602769 + 15920131920016 = 2215113^2 + 3990004^2 .

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 20826857522785 - 2²³ = 20826849134177 is a prime.

It is a super-2 number, since 2×20826857522785² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20826857522785.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19107208192 + ... + 19107209281.

It is an arithmetic number, because the mean of its divisors is an integer number (3152689441605).

Almost surely, 2^{20826857522785} is an apocalyptic number.

It is an amenable number.

20826857522785 is a deficient number, since it is larger than the sum of its proper divisors (4394658010055).

20826857522785 is a wasteful number, since it uses less digits than its factorization.

20826857522785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38214417587.

The product of its (nonzero) digits is 301056000, while the sum is 67.

The spelling of 20826857522785 in words is "twenty trillion, eight hundred twenty-six billion, eight hundred fifty-seven million, five hundred twenty-two thousand, seven hundred eighty-five".