20358131 has 2 divisors, whose sum is σ = 20358132. Its totient is φ = 20358130.

The previous prime is 20358089. The next prime is 20358133. The reversal of 20358131 is 13185302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20358131 - 2¹⁰ = 20357107 is a prime.

It is a super-2 number, since 2×20358131² = 828906995626322, which contains 22 as substring.

Together with 20358133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20358097 and 20358106.

It is not a weakly prime, because it can be changed into another prime (20358133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10179065 + 10179066.

It is an arithmetic number, because the mean of its divisors is an integer number (10179066).

Almost surely, 2^20358131 is an apocalyptic number.

20358131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20358131 is an equidigital number, since it uses as much as digits as its factorization.

20358131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20358131 is about 4511.9985593969. The cubic root of 20358131 is about 273.0523811881.

The spelling of 20358131 in words is "twenty million, three hundred fifty-eight thousand, one hundred thirty-one".