20185031 has 2 divisors, whose sum is σ = 20185032. Its totient is φ = 20185030.

The previous prime is 20185003. The next prime is 20185051. The reversal of 20185031 is 13058102.

It is an a-pointer prime, because the next prime (20185051) can be obtained adding 20185031 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20185031 is a prime.

It is a super-2 number, since 2×20185031² = 814870952941922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20184994 and 20185012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20185051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10092515 + 10092516.

It is an arithmetic number, because the mean of its divisors is an integer number (10092516).

Almost surely, 2^20185031 is an apocalyptic number.

20185031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20185031 is an equidigital number, since it uses as much as digits as its factorization.

20185031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 20185031 is about 4492.7754228316. The cubic root of 20185031 is about 272.2762790762.

The spelling of 20185031 in words is "twenty million, one hundred eighty-five thousand, thirty-one".