20080221 has 16 divisors (see below), whose sum is σ = 30662784. Its totient is φ = 11450304.

The previous prime is 20080211. The next prime is 20080223. The reversal of 20080221 is 12208002.

It is not a de Polignac number, because 20080221 - 2¹³ = 20072029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20080221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20080223) 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 15 ways as a sum of consecutive naturals, for example, 15615 + ... + 16851.

It is an arithmetic number, because the mean of its divisors is an integer number (1916424).

Almost surely, 2^20080221 is an apocalyptic number.

20080221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20080221 is a deficient number, since it is larger than the sum of its proper divisors (10582563).

20080221 is a wasteful number, since it uses less digits than its factorization.

20080221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 20080221 is about 4481.0959596956. The cubic root of 20080221 is about 271.8041996643.

Adding to 20080221 its reverse (12208002), we get a palindrome (32288223).

It can be divided in two parts, 20080 and 221, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 20080221 in words is "twenty million, eighty thousand, two hundred twenty-one".