22720207 has 4 divisors (see below), whose sum is σ = 22835736. Its totient is φ = 22604680.

The previous prime is 22720189. The next prime is 22720237. The reversal of 22720207 is 70202722.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22720207 is a prime.

It is a super-2 number, since 2×22720207² = 1032415612245698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22720237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57469 + ... + 57862.

It is an arithmetic number, because the mean of its divisors is an integer number (5708934).

Almost surely, 2^22720207 is an apocalyptic number.

22720207 is a deficient number, since it is larger than the sum of its proper divisors (115529).

22720207 is a wasteful number, since it uses less digits than its factorization.

22720207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115528.

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 22720207 is about 4766.5718288934. The cubic root of 22720207 is about 283.2288101961.

Adding to 22720207 its reverse (70202722), we get a palindrome (92922929).

The spelling of 22720207 in words is "twenty-two million, seven hundred twenty thousand, two hundred seven".