16220320 has 24 divisors (see below), whose sum is σ = 38320884. Its totient is φ = 6488064.

The previous prime is 16220287. The next prime is 16220371. The reversal of 16220320 is 2302261.

It can be written as a sum of positive squares in 2 ways, for example, as 15586704 + 633616 = 3948^2 + 796^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 16220294 and 16220303.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50529 + ... + 50848.

Almost surely, 2^16220320 is an apocalyptic number.

16220320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16220320 is an abundant number, since it is smaller than the sum of its proper divisors (22100564).

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

16220320 is a wasteful number, since it uses less digits than its factorization.

16220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101392 (or 101384 counting only the distinct ones).

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

The square root of 16220320 is about 4027.4458407283. The cubic root of 16220320 is about 253.1355489177.

Adding to 16220320 its reverse (2302261), we get a palindrome (18522581).

The spelling of 16220320 in words is "sixteen million, two hundred twenty thousand, three hundred twenty".