16990020 has 96 divisors (see below), whose sum is σ = 53706240. Its totient is φ = 4458240.

The previous prime is 16990019. The next prime is 16990033. The reversal of 16990020 is 2009961.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39205 + ... + 39635.

It is an arithmetic number, because the mean of its divisors is an integer number (559440).

Almost surely, 2^16990020 is an apocalyptic number.

16990020 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 16990020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26853120).

16990020 is an abundant number, since it is smaller than the sum of its proper divisors (36716220).

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

16990020 is a wasteful number, since it uses less digits than its factorization.

16990020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 16990020 is about 4121.8951951742. The cubic root of 16990020 is about 257.0778327649.

Adding to 16990020 its reverse (2009961), we get a palindrome (18999981).

The spelling of 16990020 in words is "sixteen million, nine hundred ninety thousand, twenty".