20513371 has 2 divisors, whose sum is σ = 20513372. Its totient is φ = 20513370.

The previous prime is 20513341. The next prime is 20513393. The reversal of 20513371 is 17331502.

It is an a-pointer prime, because the next prime (20513393) can be obtained adding 20513371 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20513371 is a prime.

It is not a weakly prime, because it can be changed into another prime (20513341) 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, 10256685 + 10256686.

It is an arithmetic number, because the mean of its divisors is an integer number (10256686).

Almost surely, 2^20513371 is an apocalyptic number.

20513371 is a deficient number, since it is larger than the sum of its proper divisors (1).

20513371 is an equidigital number, since it uses as much as digits as its factorization.

20513371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20513371 is about 4529.1689083098. The cubic root of 20513371 is about 273.7446739718.

Adding to 20513371 its reverse (17331502), we get a palindrome (37844873).

The spelling of 20513371 in words is "twenty million, five hundred thirteen thousand, three hundred seventy-one".