22136520 has 192 divisors, whose sum is σ = 81198720. Its totient is φ = 4727808.

The previous prime is 22136509. The next prime is 22136531. The reversal of 22136520 is 2563122.

It is an interprime number because it is at equal distance from previous prime (22136509) and next prime (22136531).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 303204 + ... + 303276.

It is an arithmetic number, because the mean of its divisors is an integer number (422910).

Almost surely, 2^22136520 is an apocalyptic number.

22136520 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 22136520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40599360).

22136520 is an abundant number, since it is smaller than the sum of its proper divisors (59062200).

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

22136520 is a wasteful number, since it uses less digits than its factorization.

22136520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 22136520 is about 4704.9463333815. The cubic root of 22136520 is about 280.7823358829.

Adding to 22136520 its reverse (2563122), we get a palindrome (24699642).

The spelling of 22136520 in words is "twenty-two million, one hundred thirty-six thousand, five hundred twenty".