16490020 has 12 divisors (see below), whose sum is σ = 34629084. Its totient is φ = 6596000.

The previous prime is 16489999. The next prime is 16490021. The reversal of 16490020 is 2009461.

It can be written as a sum of positive squares in 2 ways, for example, as 12054784 + 4435236 = 3472^2 + 2106^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16489973 and 16490000.

It is not an unprimeable number, because it can be changed into a prime (16490021) 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, 412231 + ... + 412270.

It is an arithmetic number, because the mean of its divisors is an integer number (2885757).

Almost surely, 2^16490020 is an apocalyptic number.

16490020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16490020 is an abundant number, since it is smaller than the sum of its proper divisors (18139064).

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

16490020 is a wasteful number, since it uses less digits than its factorization.

16490020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824510 (or 824508 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 16490020 is about 4060.7905634248. The cubic root of 16490020 is about 254.5308302513.

Adding to 16490020 its reverse (2009461), we get a palindrome (18499481).

The spelling of 16490020 in words is "sixteen million, four hundred ninety thousand, twenty".