20931683 has 2 divisors, whose sum is σ = 20931684. Its totient is φ = 20931682.

The previous prime is 20931667. The next prime is 20931719. The reversal of 20931683 is 38613902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20931683 - 2⁴ = 20931667 is a prime.

It is not a weakly prime, because it can be changed into another prime (20931623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10465841 + 10465842.

It is an arithmetic number, because the mean of its divisors is an integer number (10465842).

Almost surely, 2^20931683 is an apocalyptic number.

20931683 is a deficient number, since it is larger than the sum of its proper divisors (1).

20931683 is an equidigital number, since it uses as much as digits as its factorization.

20931683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20931683 is about 4575.1156269541. The cubic root of 20931683 is about 275.5929157622.

The spelling of 20931683 in words is "twenty million, nine hundred thirty-one thousand, six hundred eighty-three".