16117520 has 80 divisors (see below), whose sum is σ = 39664128. Its totient is φ = 6082560.

The previous prime is 16117511. The next prime is 16117531. The reversal of 16117520 is 2571161.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166112 + ... + 166208.

Almost surely, 2^16117520 is an apocalyptic number.

16117520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16117520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19832064).

16117520 is an abundant number, since it is smaller than the sum of its proper divisors (23546608).

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

16117520 is a wasteful number, since it uses less digits than its factorization.

16117520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 16117520 is about 4014.6631240990. The cubic root of 16117520 is about 252.5996469753.

Adding to 16117520 its reverse (2571161), we get a palindrome (18688681).

The spelling of 16117520 in words is "sixteen million, one hundred seventeen thousand, five hundred twenty".