20208357 has 12 divisors (see below), whose sum is σ = 31435404. Its totient is φ = 12435840.

The previous prime is 20208347. The next prime is 20208379. The reversal of 20208357 is 75380202.

It can be written as a sum of positive squares in 2 ways, for example, as 2643876 + 17564481 = 1626^2 + 4191^2 .

It is not a de Polignac number, because 20208357 - 2⁸ = 20208101 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20208357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20208347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86244 + ... + 86477.

It is an arithmetic number, because the mean of its divisors is an integer number (2619617).

Almost surely, 2^20208357 is an apocalyptic number.

It is an amenable number.

20208357 is a deficient number, since it is larger than the sum of its proper divisors (11227047).

20208357 is a wasteful number, since it uses less digits than its factorization.

20208357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172740 (or 172737 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20208357 is about 4495.3706187588. The cubic root of 20208357 is about 272.3811203253.

Adding to 20208357 its reverse (75380202), we get a palindrome (95588559).

The spelling of 20208357 in words is "twenty million, two hundred eight thousand, three hundred fifty-seven".