20016439 has 2 divisors, whose sum is σ = 20016440. Its totient is φ = 20016438.

The previous prime is 20016431. The next prime is 20016461. The reversal of 20016439 is 93461002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20016439 - 2³ = 20016431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20016431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008219 + 10008220.

It is an arithmetic number, because the mean of its divisors is an integer number (10008220).

Almost surely, 2^20016439 is an apocalyptic number.

20016439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20016439 is an equidigital number, since it uses as much as digits as its factorization.

20016439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20016439 is about 4473.9735135559. The cubic root of 20016439 is about 271.5161118112.

The spelling of 20016439 in words is "twenty million, sixteen thousand, four hundred thirty-nine".