20363857 has 2 divisors, whose sum is σ = 20363858. Its totient is φ = 20363856.

The previous prime is 20363851. The next prime is 20363867. The reversal of 20363857 is 75836302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 77841 = 4504^2 + 279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20363857 is a prime.

It is a super-3 number, since 3×20363857³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20363851) 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 as a sum of consecutive naturals, namely, 10181928 + 10181929.

It is an arithmetic number, because the mean of its divisors is an integer number (10181929).

Almost surely, 2^20363857 is an apocalyptic number.

It is an amenable number.

20363857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20363857 is an equidigital number, since it uses as much as digits as its factorization.

20363857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20363857 is about 4512.6330451301. The cubic root of 20363857 is about 273.0779786815.

The spelling of 20363857 in words is "twenty million, three hundred sixty-three thousand, eight hundred fifty-seven".