20411387 has 2 divisors, whose sum is σ = 20411388. Its totient is φ = 20411386.

The previous prime is 20411381. The next prime is 20411411. The reversal of 20411387 is 78311402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20411387 - 2⁴ = 20411371 is a prime.

It is not a weakly prime, because it can be changed into another prime (20411381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10205693 + 10205694.

It is an arithmetic number, because the mean of its divisors is an integer number (10205694).

Almost surely, 2^20411387 is an apocalyptic number.

20411387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20411387 is an equidigital number, since it uses as much as digits as its factorization.

20411387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20411387 is about 4517.8963024842. The cubic root of 20411387 is about 273.2902716551.

Adding to 20411387 its reverse (78311402), we get a palindrome (98722789).

The spelling of 20411387 in words is "twenty million, four hundred eleven thousand, three hundred eighty-seven".