16172020 has 12 divisors (see below), whose sum is σ = 33961284. Its totient is φ = 6468800.

The previous prime is 16172017. The next prime is 16172033. The reversal of 16172020 is 2027161.

It can be written as a sum of positive squares in 2 ways, for example, as 12645136 + 3526884 = 3556^2 + 1878^2 .

It is a congruent number.

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, 404281 + ... + 404320.

It is an arithmetic number, because the mean of its divisors is an integer number (2830107).

Almost surely, 2^16172020 is an apocalyptic number.

16172020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16172020 is an abundant number, since it is smaller than the sum of its proper divisors (17789264).

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

16172020 is a wasteful number, since it uses less digits than its factorization.

16172020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808610 (or 808608 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 16172020 is about 4021.4450139222. The cubic root of 16172020 is about 252.8840412844.

Adding to 16172020 its reverse (2027161), we get a palindrome (18199181).

The spelling of 16172020 in words is "sixteen million, one hundred seventy-two thousand, twenty".