23220340 has 96 divisors (see below), whose sum is σ = 59947776. Its totient is φ = 7434240.

The previous prime is 23220319. The next prime is 23220347. The reversal of 23220340 is 4302232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23220347) 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, 65604 + ... + 65956.

It is an arithmetic number, because the mean of its divisors is an integer number (624456).

Almost surely, 2^23220340 is an apocalyptic number.

23220340 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 23220340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29973888).

23220340 is an abundant number, since it is smaller than the sum of its proper divisors (36727436).

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

23220340 is a wasteful number, since it uses less digits than its factorization.

23220340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 23220340 is about 4818.7488002593. The cubic root of 23220340 is about 285.2919548453.

Adding to 23220340 its reverse (4302232), we get a palindrome (27522572).

The spelling of 23220340 in words is "twenty-three million, two hundred twenty thousand, three hundred forty".