22157550 has 60 divisors (see below), whose sum is σ = 61576416. Its totient is φ = 5907600.

The previous prime is 22157549. The next prime is 22157581. The reversal of 22157550 is 5575122.

It is a happy number.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1315 + ... + 6785.

Almost surely, 2^22157550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22157550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30788208).

22157550 is an abundant number, since it is smaller than the sum of its proper divisors (39418866).

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

22157550 is a wasteful number, since it uses less digits than its factorization.

22157550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5495 (or 5481 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 22157550 is about 4707.1806848686. The cubic root of 22157550 is about 280.8712234408.

The spelling of 22157550 in words is "twenty-two million, one hundred fifty-seven thousand, five hundred fifty".