20369857 has 2 divisors, whose sum is σ = 20369858. Its totient is φ = 20369856.

The previous prime is 20369851. The next prime is 20369863. The reversal of 20369857 is 75896302.

It is a balanced prime because it is at equal distance from previous prime (20369851) and next prime (20369863).

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 20736 = 4511^2 + 144^2 .

It is a cyclic number.

It is not a de Polignac number, because 20369857 - 2¹⁵ = 20337089 is a prime.

It is not a weakly prime, because it can be changed into another prime (20369851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10184928 + 10184929.

It is an arithmetic number, because the mean of its divisors is an integer number (10184929).

Almost surely, 2^20369857 is an apocalyptic number.

It is an amenable number.

20369857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20369857 is an equidigital number, since it uses as much as digits as its factorization.

20369857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20369857 is about 4513.2977965120. The cubic root of 20369857 is about 273.1047959159.

The spelling of 20369857 in words is "twenty million, three hundred sixty-nine thousand, eight hundred fifty-seven".