22501557 has 48 divisors (see below), whose sum is σ = 38525760. Its totient is φ = 13001472.

The previous prime is 22501543. The next prime is 22501561. The reversal of 22501557 is 75510522.

It is a happy number.

It is not a de Polignac number, because 22501557 - 2²² = 18307253 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 22501557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22501517) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53494 + ... + 53912.

It is an arithmetic number, because the mean of its divisors is an integer number (802620).

Almost surely, 2^22501557 is an apocalyptic number.

22501557 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

22501557 is a deficient number, since it is larger than the sum of its proper divisors (16024203).

22501557 is a wasteful number, since it uses less digits than its factorization.

22501557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 452 counting only the distinct ones).

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

The square root of 22501557 is about 4743.5806096239. The cubic root of 22501557 is about 282.3173204834.

The spelling of 22501557 in words is "twenty-two million, five hundred one thousand, five hundred fifty-seven".