23420540 has 96 divisors (see below), whose sum is σ = 60963840. Its totient is φ = 7430400.

The previous prime is 23420533. The next prime is 23420563. The reversal of 23420540 is 4502432.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54125 + ... + 54555.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^23420540 is an apocalyptic number.

23420540 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 23420540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30481920).

23420540 is an abundant number, since it is smaller than the sum of its proper divisors (37543300).

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

23420540 is a wasteful number, since it uses less digits than its factorization.

23420540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 23420540 is about 4839.4772444966. The cubic root of 23420540 is about 286.1095151686.

Adding to 23420540 its reverse (4502432), we get a palindrome (27922972).

The spelling of 23420540 in words is "twenty-three million, four hundred twenty thousand, five hundred forty".