16117220 has 24 divisors (see below), whose sum is σ = 38681664. Its totient is φ = 5525856.

The previous prime is 16117151. The next prime is 16117253. The reversal of 16117220 is 2271161.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 16117192 and 16117201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57422 + ... + 57701.

It is an arithmetic number, because the mean of its divisors is an integer number (1611736).

Almost surely, 2^16117220 is an apocalyptic number.

16117220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16117220 is an abundant number, since it is smaller than the sum of its proper divisors (22564444).

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

16117220 is a wasteful number, since it uses less digits than its factorization.

16117220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115139 (or 115137 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 16117220 is about 4014.6257608898. The cubic root of 16117220 is about 252.5980797291.

Adding to 16117220 its reverse (2271161), we get a palindrome (18388381).

The spelling of 16117220 in words is "sixteen million, one hundred seventeen thousand, two hundred twenty".