20270389 has 2 divisors, whose sum is σ = 20270390. Its totient is φ = 20270388.

The previous prime is 20270357. The next prime is 20270417. The reversal of 20270389 is 98307202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 6543364 = 3705^2 + 2558^2 .

It is a cyclic number.

It is not a de Polignac number, because 20270389 - 2⁵ = 20270357 is a prime.

It is a super-2 number, since 2×20270389² = 821777340422642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20270389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20270989) 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, 10135194 + 10135195.

It is an arithmetic number, because the mean of its divisors is an integer number (10135195).

Almost surely, 2^20270389 is an apocalyptic number.

It is an amenable number.

20270389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20270389 is an equidigital number, since it uses as much as digits as its factorization.

20270389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20270389 is about 4502.2648744826. The cubic root of 20270389 is about 272.6595379228.

The spelling of 20270389 in words is "twenty million, two hundred seventy thousand, three hundred eighty-nine".