20341891 has 2 divisors, whose sum is σ = 20341892. Its totient is φ = 20341890.

The previous prime is 20341879. The next prime is 20341901. The reversal of 20341891 is 19814302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20341891 - 2¹³ = 20333699 is a prime.

It is not a weakly prime, because it can be changed into another prime (20341801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170945 + 10170946.

It is an arithmetic number, because the mean of its divisors is an integer number (10170946).

Almost surely, 2^20341891 is an apocalyptic number.

20341891 is the 2853-rd centered pentagonal number.

20341891 is a deficient number, since it is larger than the sum of its proper divisors (1).

20341891 is an equidigital number, since it uses as much as digits as its factorization.

20341891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20341891 is about 4510.1985543876. The cubic root of 20341891 is about 272.9797558193.

The spelling of 20341891 in words is "twenty million, three hundred forty-one thousand, eight hundred ninety-one".