20506323 has 8 divisors (see below), whose sum is σ = 27391936. Its totient is φ = 13645800.

The previous prime is 20506319. The next prime is 20506327. The reversal of 20506323 is 32360502.

It is an interprime number because it is at equal distance from previous prime (20506319) and next prime (20506327).

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

It is not a de Polignac number, because 20506323 - 2² = 20506319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20506323.

It is not an unprimeable number, because it can be changed into a prime (20506327) 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, 4273 + ... + 7698.

It is an arithmetic number, because the mean of its divisors is an integer number (3423992).

Almost surely, 2^20506323 is an apocalyptic number.

20506323 is a deficient number, since it is larger than the sum of its proper divisors (6885613).

20506323 is a wasteful number, since it uses less digits than its factorization.

20506323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12545.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20506323 is about 4528.3907737738. The cubic root of 20506323 is about 273.7133192444.

Adding to 20506323 its reverse (32360502), we get a palindrome (52866825).

The spelling of 20506323 in words is "twenty million, five hundred six thousand, three hundred twenty-three".