20066731 has 2 divisors, whose sum is σ = 20066732. Its totient is φ = 20066730.

The previous prime is 20066729. The next prime is 20066771. The reversal of 20066731 is 13766002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20066731 - 2¹ = 20066729 is a prime.

It is a super-2 number, since 2×20066731² = 805347386052722, which contains 22 as substring.

Together with 20066729, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20066696 and 20066705.

It is not a weakly prime, because it can be changed into another prime (20066771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10033365 + 10033366.

It is an arithmetic number, because the mean of its divisors is an integer number (10033366).

Almost surely, 2^20066731 is an apocalyptic number.

20066731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20066731 is an equidigital number, since it uses as much as digits as its factorization.

20066731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20066731 is about 4479.5904946769. The cubic root of 20066731 is about 271.7433195234.

The spelling of 20066731 in words is "twenty million, sixty-six thousand, seven hundred thirty-one".