20485439 has 16 divisors (see below), whose sum is σ = 23395680. Its totient is φ = 17781120.

The previous prime is 20485427. The next prime is 20485441. The reversal of 20485439 is 93458402.

It is a cyclic number.

It is not a de Polignac number, because 20485439 - 2²⁴ = 3708223 is a prime.

It is a super-2 number, since 2×20485439² = 839306422045442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20485399 and 20485408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20485469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48449 + ... + 48869.

It is an arithmetic number, because the mean of its divisors is an integer number (1462230).

Almost surely, 2^20485439 is an apocalyptic number.

20485439 is a deficient number, since it is larger than the sum of its proper divisors (2910241).

20485439 is a wasteful number, since it uses less digits than its factorization.

20485439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20485439 is about 4526.0842899796. The cubic root of 20485439 is about 273.6203695307.

The spelling of 20485439 in words is "twenty million, four hundred eighty-five thousand, four hundred thirty-nine".