20257460357 has 2 divisors, whose sum is σ = 20257460358. Its totient is φ = 20257460356.

The previous prime is 20257460297. The next prime is 20257460369. The reversal of 20257460357 is 75306475202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20041781761 + 215678596 = 141569^2 + 14686^2 .

It is a cyclic number.

It is not a de Polignac number, because 20257460357 - 2¹⁰ = 20257459333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20257465357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128730178 + 10128730179.

It is an arithmetic number, because the mean of its divisors is an integer number (10128730179).

Almost surely, 2^20257460357 is an apocalyptic number.

It is an amenable number.

20257460357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20257460357 is an equidigital number, since it uses as much as digits as its factorization.

20257460357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 41.

The spelling of 20257460357 in words is "twenty billion, two hundred fifty-seven million, four hundred sixty thousand, three hundred fifty-seven".