22155550 has 36 divisors (see below), whose sum is σ = 42325416. Its totient is φ = 8626800.

The previous prime is 22155547. The next prime is 22155559. The reversal of 22155550 is 5555122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22155559) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 280411 + ... + 280489.

It is an arithmetic number, because the mean of its divisors is an integer number (1175706).

Almost surely, 2^22155550 is an apocalyptic number.

22155550 is a deficient number, since it is larger than the sum of its proper divisors (20169866).

22155550 is an equidigital number, since it uses as much as digits as its factorization.

22155550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 22155550 is about 4706.9682386861. The cubic root of 22155550 is about 280.8627724561.

The spelling of 22155550 in words is "twenty-two million, one hundred fifty-five thousand, five hundred fifty".