20490210 has 96 divisors (see below), whose sum is σ = 58339008. Its totient is φ = 4959360.

The previous prime is 20490199. The next prime is 20490229. The reversal of 20490210 is 1209402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97005 + ... + 97215.

It is an arithmetic number, because the mean of its divisors is an integer number (607698).

Almost surely, 2^20490210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20490210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29169504).

20490210 is an abundant number, since it is smaller than the sum of its proper divisors (37848798).

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

20490210 is a wasteful number, since it uses less digits than its factorization.

20490210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20490210 is about 4526.6113153219. The cubic root of 20490210 is about 273.6416096816.

Adding to 20490210 its reverse (1209402), we get a palindrome (21699612).

The spelling of 20490210 in words is "twenty million, four hundred ninety thousand, two hundred ten".