22720140 has 36 divisors (see below), whose sum is σ = 68918304. Its totient is φ = 6058656.

The previous prime is 22720127. The next prime is 22720189. The reversal of 22720140 is 4102722.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×22720140³ (a number of 23 digits) contains 333 as substring.

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

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 11 ways as a sum of consecutive naturals, for example, 62932 + ... + 63291.

Almost surely, 2^22720140 is an apocalyptic number.

22720140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22720140 is an abundant number, since it is smaller than the sum of its proper divisors (46198164).

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

22720140 is a wasteful number, since it uses less digits than its factorization.

22720140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126238 (or 126233 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22720140 is about 4766.5648007763. The cubic root of 22720140 is about 283.2285317898.

Adding to 22720140 its reverse (4102722), we get a palindrome (26822862).

The spelling of 22720140 in words is "twenty-two million, seven hundred twenty thousand, one hundred forty".