20701439 has 4 divisors (see below), whose sum is σ = 22583400. Its totient is φ = 18819480.

The previous prime is 20701423. The next prime is 20701441. The reversal of 20701439 is 93410702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20701439 - 2⁴ = 20701423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20701039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 940964 + ... + 940985.

It is an arithmetic number, because the mean of its divisors is an integer number (5645850).

Almost surely, 2^20701439 is an apocalyptic number.

20701439 is a deficient number, since it is larger than the sum of its proper divisors (1881961).

20701439 is a wasteful number, since it uses less digits than its factorization.

20701439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881960.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20701439 is about 4549.8834050995. The cubic root of 20701439 is about 274.5787003536.

The spelling of 20701439 in words is "twenty million, seven hundred one thousand, four hundred thirty-nine".