20506343 has 8 divisors (see below), whose sum is σ = 24091536. Its totient is φ = 17208000.

The previous prime is 20506337. The next prime is 20506349. The reversal of 20506343 is 34360502.

It is an interprime number because it is at equal distance from previous prime (20506337) and next prime (20506349).

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 20506343 - 2⁴ = 20506327 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 (20506349) 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, 71558 + ... + 71843.

It is an arithmetic number, because the mean of its divisors is an integer number (3011442).

Almost surely, 2^20506343 is an apocalyptic number.

20506343 is a deficient number, since it is larger than the sum of its proper divisors (3585193).

20506343 is a wasteful number, since it uses less digits than its factorization.

20506343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143425.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 20506343 is about 4528.3929820633. The cubic root of 20506343 is about 273.7134082294.

Adding to 20506343 its reverse (34360502), we get a palindrome (54866845).

The spelling of 20506343 in words is "twenty million, five hundred six thousand, three hundred forty-three".