20209210 has 64 divisors (see below), whose sum is σ = 43868160. Its totient is φ = 6557760.

The previous prime is 20209207. The next prime is 20209213. The reversal of 20209210 is 1290202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20209207) and next prime (20209213).

It is not an unprimeable number, because it can be changed into a prime (20209213) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 145321 + ... + 145459.

It is an arithmetic number, because the mean of its divisors is an integer number (685440).

Almost surely, 2^20209210 is an apocalyptic number.

20209210 is an abundant number, since it is smaller than the sum of its proper divisors (23658950).

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

20209210 is a wasteful number, since it uses less digits than its factorization.

20209210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20209210 is about 4495.4654931386. The cubic root of 20209210 is about 272.3849526973.

Adding to 20209210 its reverse (1290202), we get a palindrome (21499412).

The spelling of 20209210 in words is "twenty million, two hundred nine thousand, two hundred ten".