22720417 has 4 divisors (see below), whose sum is σ = 22757056. Its totient is φ = 22683780.

The previous prime is 22720393. The next prime is 22720421. The reversal of 22720417 is 71402722.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22720417 - 2²³ = 14331809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22720391 and 22720400.

It is not an unprimeable number, because it can be changed into a prime (22720457) 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, 17373 + ... + 18634.

It is an arithmetic number, because the mean of its divisors is an integer number (5689264).

Almost surely, 2^22720417 is an apocalyptic number.

It is an amenable number.

22720417 is a deficient number, since it is larger than the sum of its proper divisors (36639).

22720417 is an equidigital number, since it uses as much as digits as its factorization.

22720417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36638.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 22720417 is about 4766.5938572528. The cubic root of 22720417 is about 283.2296828094.

The spelling of 22720417 in words is "twenty-two million, seven hundred twenty thousand, four hundred seventeen".