20017031 has 2 divisors, whose sum is σ = 20017032. Its totient is φ = 20017030.

The previous prime is 20017009. The next prime is 20017043. The reversal of 20017031 is 13071002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20017031 - 2²² = 15822727 is a prime.

It is a super-2 number, since 2×20017031² = 801363060109922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20016997 and 20017015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20017001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008515 + 10008516.

It is an arithmetic number, because the mean of its divisors is an integer number (10008516).

Almost surely, 2^20017031 is an apocalyptic number.

20017031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20017031 is an equidigital number, since it uses as much as digits as its factorization.

20017031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 20017031 is about 4474.0396734942. The cubic root of 20017031 is about 271.5187885436.

Adding to 20017031 its reverse (13071002), we get a palindrome (33088033).

The spelling of 20017031 in words is "twenty million, seventeen thousand, thirty-one".