22820140 has 96 divisors (see below), whose sum is σ = 60318720. Its totient is φ = 7070976.

The previous prime is 22820113. The next prime is 22820141. The reversal of 22820140 is 4102822.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (22820141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60994 + ... + 61366.

It is an arithmetic number, because the mean of its divisors is an integer number (628320).

Almost surely, 2^22820140 is an apocalyptic number.

22820140 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 22820140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30159360).

22820140 is an abundant number, since it is smaller than the sum of its proper divisors (37498580).

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

22820140 is a wasteful number, since it uses less digits than its factorization.

22820140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 22820140 is about 4777.0430184372. The cubic root of 22820140 is about 283.6434558947.

Adding to 22820140 its reverse (4102822), we get a palindrome (26922962).

The spelling of 22820140 in words is "twenty-two million, eight hundred twenty thousand, one hundred forty".