22001520 has 40 divisors (see below), whose sum is σ = 68205456. Its totient is φ = 5867008.

The previous prime is 22001503. The next prime is 22001533. The reversal of 22001520 is 2510022.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 22001496 and 22001505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45597 + ... + 46076.

Almost surely, 2^22001520 is an apocalyptic number.

22001520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001520 is an abundant number, since it is smaller than the sum of its proper divisors (46203936).

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

22001520 is a wasteful number, since it uses less digits than its factorization.

22001520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91689 (or 91683 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 22001520 is about 4690.5777895692. The cubic root of 22001520 is about 280.2103860984.

Adding to 22001520 its reverse (2510022), we get a palindrome (24511542).

The spelling of 22001520 in words is "twenty-two million, one thousand, five hundred twenty".