22154004 has 18 divisors (see below), whose sum is σ = 56000490. Its totient is φ = 7384656.

The previous prime is 22154003. The next prime is 22154021. The reversal of 22154004 is 40045122.

It can be written as a sum of positive squares in only one way, i.e., 12531600 + 9622404 = 3540^2 + 3102^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22154003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 307659 + ... + 307730.

Almost surely, 2^22154004 is an apocalyptic number.

It is an amenable number.

22154004 is an abundant number, since it is smaller than the sum of its proper divisors (33846486).

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

22154004 is a wasteful number, since it uses less digits than its factorization.

22154004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615399 (or 615394 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 22154004 is about 4706.8040112161. The cubic root of 22154004 is about 280.8562394964.

Adding to 22154004 its reverse (40045122), we get a palindrome (62199126).

The spelling of 22154004 in words is "twenty-two million, one hundred fifty-four thousand, four".