20357575757 has 4 divisors (see below), whose sum is σ = 20358463356. Its totient is φ = 20356688160.

The previous prime is 20357575739. The next prime is 20357575781. The reversal of 20357575757 is 75757575302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75757575302 = 2 ⋅37878787651.

It can be written as a sum of positive squares in 2 ways, for example, as 13185010276 + 7172565481 = 114826^2 + 84691^2 .

It is a cyclic number.

It is not a de Polignac number, because 20357575757 - 2¹⁴ = 20357559373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20357575699 and 20357575708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20357575727) 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, 408458 + ... + 455579.

It is an arithmetic number, because the mean of its divisors is an integer number (5089615839).

Almost surely, 2^20357575757 is an apocalyptic number.

It is an amenable number.

20357575757 is a deficient number, since it is larger than the sum of its proper divisors (887599).

20357575757 is an equidigital number, since it uses as much as digits as its factorization.

20357575757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887598.

The product of its (nonzero) digits is 9003750, while the sum is 53.

The spelling of 20357575757 in words is "twenty billion, three hundred fifty-seven million, five hundred seventy-five thousand, seven hundred fifty-seven".