20722245 has 8 divisors (see below), whose sum is σ = 33155616. Its totient is φ = 11051856.

The previous prime is 20722237. The next prime is 20722277. The reversal of 20722245 is 54222702.

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

It is not a de Polignac number, because 20722245 - 2³ = 20722237 is a prime.

It is a super-2 number, since 2×20722245² = 858822875680050, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 690727 + ... + 690756.

It is an arithmetic number, because the mean of its divisors is an integer number (4144452).

Almost surely, 2^20722245 is an apocalyptic number.

It is an amenable number.

20722245 is a deficient number, since it is larger than the sum of its proper divisors (12433371).

20722245 is a wasteful number, since it uses less digits than its factorization.

20722245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381491.

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 20722245 is about 4552.1692631096. The cubic root of 20722245 is about 274.6706580769.

Adding to 20722245 its reverse (54222702), we get a palindrome (74944947).

The spelling of 20722245 in words is "twenty million, seven hundred twenty-two thousand, two hundred forty-five".