22154805 has 24 divisors (see below), whose sum is σ = 38584728. Its totient is φ = 11759616.

The previous prime is 22154777. The next prime is 22154809. The reversal of 22154805 is 50845122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1004004 + 21150801 = 1002^2 + 4599^2 .

It is not a de Polignac number, because 22154805 - 2⁸ = 22154549 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22154809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9429 + ... + 11541.

It is an arithmetic number, because the mean of its divisors is an integer number (1607697).

Almost surely, 2^22154805 is an apocalyptic number.

It is an amenable number.

22154805 is a deficient number, since it is larger than the sum of its proper divisors (16429923).

22154805 is a wasteful number, since it uses less digits than its factorization.

22154805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357 (or 2354 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 22154805 is about 4706.8891000320. The cubic root of 22154805 is about 280.8596243343.

Adding to 22154805 its reverse (50845122), we get a palindrome (72999927).

The spelling of 22154805 in words is "twenty-two million, one hundred fifty-four thousand, eight hundred five".