22515550 has 12 divisors (see below), whose sum is σ = 41879016. Its totient is φ = 9006200.

The previous prime is 22515547. The next prime is 22515557. The reversal of 22515550 is 5551522.

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 (22515557) 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, 225106 + ... + 225205.

It is an arithmetic number, because the mean of its divisors is an integer number (3489918).

Almost surely, 2^22515550 is an apocalyptic number.

22515550 is a deficient number, since it is larger than the sum of its proper divisors (19363466).

22515550 is a wasteful number, since it uses less digits than its factorization.

22515550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450323 (or 450318 counting only the distinct ones).

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

The square root of 22515550 is about 4745.0553210684. The cubic root of 22515550 is about 282.3758297332.

The spelling of 22515550 in words is "twenty-two million, five hundred fifteen thousand, five hundred fifty".