20506316 has 6 divisors (see below), whose sum is σ = 35886060. Its totient is φ = 10253156.

The previous prime is 20506303. The next prime is 20506319. The reversal of 20506316 is 61360502.

It is a junction number, because it is equal to n+sod(n) for n = 20506291 and 20506300.

It is not an unprimeable number, because it can be changed into a prime (20506319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2563286 + ... + 2563293.

It is an arithmetic number, because the mean of its divisors is an integer number (5981010).

Almost surely, 2^20506316 is an apocalyptic number.

It is an amenable number.

20506316 is a deficient number, since it is larger than the sum of its proper divisors (15379744).

20506316 is a wasteful number, since it uses less digits than its factorization.

20506316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5126583 (or 5126581 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20506316 is about 4528.3900008723. The cubic root of 20506316 is about 273.7132880997.

Adding to 20506316 its reverse (61360502), we get a palindrome (81866818).

The spelling of 20506316 in words is "twenty million, five hundred six thousand, three hundred sixteen".