20893739 has 2 divisors, whose sum is σ = 20893740. Its totient is φ = 20893738.

The previous prime is 20893727. The next prime is 20893753. The reversal of 20893739 is 93739802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20893739 - 2¹² = 20889643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20893696 and 20893705.

It is not a weakly prime, because it can be changed into another prime (20893339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10446869 + 10446870.

It is an arithmetic number, because the mean of its divisors is an integer number (10446870).

Almost surely, 2^20893739 is an apocalyptic number.

20893739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20893739 is an equidigital number, since it uses as much as digits as its factorization.

20893739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 20893739 is about 4570.9669655337. The cubic root of 20893739 is about 275.4262876148.

The spelling of 20893739 in words is "twenty million, eight hundred ninety-three thousand, seven hundred thirty-nine".