20354839 has 8 divisors (see below), whose sum is σ = 21972960. Its totient is φ = 18797856.

The previous prime is 20354827. The next prime is 20354843. The reversal of 20354839 is 93845302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20354839 - 2¹⁷ = 20223767 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 (20354849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14592 + ... + 15925.

It is an arithmetic number, because the mean of its divisors is an integer number (2746620).

Almost surely, 2^20354839 is an apocalyptic number.

20354839 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20354839 is a deficient number, since it is larger than the sum of its proper divisors (1618121).

20354839 is a wasteful number, since it uses less digits than its factorization.

20354839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30569.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 20354839 is about 4511.6337395671. The cubic root of 20354839 is about 273.0376624680.

The spelling of 20354839 in words is "twenty million, three hundred fifty-four thousand, eight hundred thirty-nine".