22013520 has 120 divisors (see below), whose sum is σ = 71182944. Its totient is φ = 5626368.

The previous prime is 22013491. The next prime is 22013539. The reversal of 22013520 is 2531022.

22013520 = T₁₄₃ + T₁₄₄ + ... + T₅₁₂.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22013520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 328527 + ... + 328593.

Almost surely, 2^22013520 is an apocalyptic number.

22013520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22013520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35591472).

22013520 is an abundant number, since it is smaller than the sum of its proper divisors (49169424).

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

22013520 is a wasteful number, since it uses less digits than its factorization.

22013520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 22013520 is about 4691.8567753076. The cubic root of 22013520 is about 280.2613206625.

Adding to 22013520 its reverse (2531022), we get a palindrome (24544542).

The spelling of 22013520 in words is "twenty-two million, thirteen thousand, five hundred twenty".