22145820 has 24 divisors (see below), whose sum is σ = 62008464. Its totient is φ = 5905536.

The previous prime is 22145813. The next prime is 22145831. The reversal of 22145820 is 2854122.

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 7 ways as a sum of consecutive naturals, for example, 184489 + ... + 184608.

It is an arithmetic number, because the mean of its divisors is an integer number (2583686).

Almost surely, 2^22145820 is an apocalyptic number.

22145820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22145820 is an abundant number, since it is smaller than the sum of its proper divisors (39862644).

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

22145820 is a wasteful number, since it uses less digits than its factorization.

22145820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369109 (or 369107 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 22145820 is about 4705.9345511811. The cubic root of 22145820 is about 280.8216511580.

Adding to 22145820 its reverse (2854122), we get a palindrome (24999942).

The spelling of 22145820 in words is "twenty-two million, one hundred forty-five thousand, eight hundred twenty".