20270791 has 2 divisors, whose sum is σ = 20270792. Its totient is φ = 20270790.

The previous prime is 20270773. The next prime is 20270821. The reversal of 20270791 is 19707202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20270791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20273791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10135395 + 10135396.

It is an arithmetic number, because the mean of its divisors is an integer number (10135396).

Almost surely, 2^20270791 is an apocalyptic number.

20270791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20270791 is an equidigital number, since it uses as much as digits as its factorization.

20270791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20270791 is about 4502.3095184583. The cubic root of 20270791 is about 272.6613403617.

Adding to 20270791 its reverse (19707202), we get a palindrome (39977993).

The spelling of 20270791 in words is "twenty million, two hundred seventy thousand, seven hundred ninety-one".