22451420 has 12 divisors (see below), whose sum is σ = 47148024. Its totient is φ = 8980560.

The previous prime is 22451413. The next prime is 22451437. The reversal of 22451420 is 2415422.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1122571 = 22451420 / (2 + 2 + 4 + 5 + 1 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 22451392 and 22451401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561266 + ... + 561305.

It is an arithmetic number, because the mean of its divisors is an integer number (3929002).

Almost surely, 2^22451420 is an apocalyptic number.

22451420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22451420 is an abundant number, since it is smaller than the sum of its proper divisors (24696604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22451420 is a wasteful number, since it uses less digits than its factorization.

22451420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122580 (or 1122578 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 22451420 is about 4738.2929415561. The cubic root of 22451420 is about 282.1074821246.

Adding to 22451420 its reverse (2415422), we get a palindrome (24866842).

The spelling of 22451420 in words is "twenty-two million, four hundred fifty-one thousand, four hundred twenty".