22523040 has 72 divisors (see below), whose sum is σ = 76864788. Its totient is φ = 6005760.

The previous prime is 22523029. The next prime is 22523051. The reversal of 22523040 is 4032522.

It is an interprime number because it is at equal distance from previous prime (22523029) and next prime (22523051).

It can be written as a sum of positive squares in 2 ways, for example, as 20684304 + 1838736 = 4548^2 + 1356^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6381 + ... + 9260.

Almost surely, 2^22523040 is an apocalyptic number.

22523040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22523040 is an abundant number, since it is smaller than the sum of its proper divisors (54341748).

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

22523040 is a wasteful number, since it uses less digits than its factorization.

22523040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15662 (or 15651 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 22523040 is about 4745.8444980846. The cubic root of 22523040 is about 282.4071378808.

Adding to 22523040 its reverse (4032522), we get a palindrome (26555562).

The spelling of 22523040 in words is "twenty-two million, five hundred twenty-three thousand, forty".