20065931 has 2 divisors, whose sum is σ = 20065932. Its totient is φ = 20065930.

The previous prime is 20065909. The next prime is 20065939. The reversal of 20065931 is 13956002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20065931 - 2¹⁰ = 20064907 is a prime.

It is a super-2 number, since 2×20065931² = 805283173793522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20065931.

It is not a weakly prime, because it can be changed into another prime (20065939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10032965 + 10032966.

It is an arithmetic number, because the mean of its divisors is an integer number (10032966).

Almost surely, 2^20065931 is an apocalyptic number.

20065931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20065931 is an equidigital number, since it uses as much as digits as its factorization.

20065931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20065931 is about 4479.5011999105. The cubic root of 20065931 is about 271.7397082801.

The spelling of 20065931 in words is "twenty million, sixty-five thousand, nine hundred thirty-one".