20221407 has 10 divisors (see below), whose sum is σ = 30207408. Its totient is φ = 13480884.

The previous prime is 20221403. The next prime is 20221427. The reversal of 20221407 is 70412202.

It is not a de Polignac number, because 20221407 - 2² = 20221403 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20221407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221403) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 124743 + ... + 124904.

Almost surely, 2^20221407 is an apocalyptic number.

20221407 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20221407 is a deficient number, since it is larger than the sum of its proper divisors (9986001).

20221407 is an equidigital number, since it uses as much as digits as its factorization.

20221407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249659 (or 249650 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 20221407 is about 4496.8218777265. The cubic root of 20221407 is about 272.4397397823.

Adding to 20221407 its reverse (70412202), we get a palindrome (90633609).

It can be divided in two parts, 202 and 21407, that added together give a square (21609 = 147²).

The spelling of 20221407 in words is "twenty million, two hundred twenty-one thousand, four hundred seven".