20657848285 has 4 divisors (see below), whose sum is σ = 24789417948. Its totient is φ = 16526278624.

The previous prime is 20657848271. The next prime is 20657848297. The reversal of 20657848285 is 58284875602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6655622724 + 14002225561 = 81582^2 + 118331^2 .

It is a cyclic number.

It is not a de Polignac number, because 20657848285 - 2¹⁹ = 20657323997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065784824 + ... + 2065784833.

It is an arithmetic number, because the mean of its divisors is an integer number (6197354487).

Almost surely, 2^20657848285 is an apocalyptic number.

It is an amenable number.

20657848285 is a deficient number, since it is larger than the sum of its proper divisors (4131569663).

20657848285 is an equidigital number, since it uses as much as digits as its factorization.

20657848285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131569662.

The product of its (nonzero) digits is 8601600, while the sum is 55.

The spelling of 20657848285 in words is "twenty billion, six hundred fifty-seven million, eight hundred forty-eight thousand, two hundred eighty-five".