16201520 has 20 divisors (see below), whose sum is σ = 37668720. Its totient is φ = 6480576.

The previous prime is 16201501. The next prime is 16201529. The reversal of 16201520 is 2510261.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (16201529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101180 + ... + 101339.

It is an arithmetic number, because the mean of its divisors is an integer number (1883436).

Almost surely, 2^16201520 is an apocalyptic number.

16201520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16201520 is an abundant number, since it is smaller than the sum of its proper divisors (21467200).

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

16201520 is a wasteful number, since it uses less digits than its factorization.

16201520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202532 (or 202526 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 16201520 is about 4025.1111785887. Note that the first 4 decimals coincide. The cubic root of 16201520 is about 253.0377130322.

Adding to 16201520 its reverse (2510261), we get a palindrome (18711781).

The spelling of 16201520 in words is "sixteen million, two hundred one thousand, five hundred twenty".