20620317 has 16 divisors (see below), whose sum is σ = 28131840. Its totient is φ = 13431600.

The previous prime is 20620289. The next prime is 20620319. The reversal of 20620317 is 71302602.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20620317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20620293 and 20620302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620319) 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, 27534 + ... + 28272.

It is an arithmetic number, because the mean of its divisors is an integer number (1758240).

Almost surely, 2^20620317 is an apocalyptic number.

It is an amenable number.

20620317 is a deficient number, since it is larger than the sum of its proper divisors (7511523).

20620317 is a wasteful number, since it uses less digits than its factorization.

20620317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20620317 is about 4540.9599205454. The cubic root of 20620317 is about 274.2195702129.

Adding to 20620317 its reverse (71302602), we get a palindrome (91922919).

The spelling of 20620317 in words is "twenty million, six hundred twenty thousand, three hundred seventeen".