20072221 has 8 divisors (see below), whose sum is σ = 22313984. Its totient is φ = 17930160.

The previous prime is 20072209. The next prime is 20072267. The reversal of 20072221 is 12227002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20072221 - 2¹⁷ = 19941149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20072195 and 20072204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20072621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24501 + ... + 25306.

It is an arithmetic number, because the mean of its divisors is an integer number (2789248).

Almost surely, 2^20072221 is an apocalyptic number.

It is an amenable number.

20072221 is a deficient number, since it is larger than the sum of its proper divisors (2241763).

20072221 is a wasteful number, since it uses less digits than its factorization.

20072221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49851.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 20072221 is about 4480.2032319974. The cubic root of 20072221 is about 271.7680990917.

Adding to 20072221 its reverse (12227002), we get a palindrome (32299223).

The spelling of 20072221 in words is "twenty million, seventy-two thousand, two hundred twenty-one".