20316220 has 24 divisors (see below), whose sum is σ = 43573824. Its totient is φ = 7953216.

The previous prime is 20316217. The next prime is 20316223. The reversal of 20316220 is 2261302.

It is an interprime number because it is at equal distance from previous prime (20316217) and next prime (20316223).

It is a junction number, because it is equal to n+sod(n) for n = 20316194 and 20316203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20316223) 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, 9867 + ... + 11746.

It is an arithmetic number, because the mean of its divisors is an integer number (1815576).

Almost surely, 2^20316220 is an apocalyptic number.

20316220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20316220 is an abundant number, since it is smaller than the sum of its proper divisors (23257604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20316220 is a wasteful number, since it uses less digits than its factorization.

20316220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21669 (or 21667 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20316220 is about 4507.3517723825. The cubic root of 20316220 is about 272.8648760830.

Adding to 20316220 its reverse (2261302), we get a palindrome (22577522).

The spelling of 20316220 in words is "twenty million, three hundred sixteen thousand, two hundred twenty".