20157069652309 has 4 divisors (see below), whose sum is σ = 20852141019660. Its totient is φ = 19461998284960.

The previous prime is 20157069652303. The next prime is 20157069652327. The reversal of 20157069652309 is 90325696075102.

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 16340165036209 + 3816904616100 = 4042297^2 + 1953690^2 .

It is a cyclic number.

It is not a de Polignac number, because 20157069652309 - 2¹¹ = 20157069650261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20157069652309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20157069652303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347535683632 + ... + 347535683689.

It is an arithmetic number, because the mean of its divisors is an integer number (5213035254915).

Almost surely, 2^{20157069652309} is an apocalyptic number.

20157069652309 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20157069652309 is a deficient number, since it is larger than the sum of its proper divisors (695071367351).

20157069652309 is an equidigital number, since it uses as much as digits as its factorization.

20157069652309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695071367350.

The product of its (nonzero) digits is 6123600, while the sum is 55.

The spelling of 20157069652309 in words is "twenty trillion, one hundred fifty-seven billion, sixty-nine million, six hundred fifty-two thousand, three hundred nine".