23140740 has 144 divisors (see below), whose sum is σ = 79978752. Its totient is φ = 4967424.

The previous prime is 23140729. The next prime is 23140771. The reversal of 23140740 is 4704132.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49749 + ... + 50211.

It is an arithmetic number, because the mean of its divisors is an integer number (555408).

Almost surely, 2^23140740 is an apocalyptic number.

23140740 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 23140740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39989376).

23140740 is an abundant number, since it is smaller than the sum of its proper divisors (56838012).

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

23140740 is a wasteful number, since it uses less digits than its factorization.

23140740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 23140740 is about 4810.4823043017. The cubic root of 23140740 is about 284.9655852566.

Adding to 23140740 its reverse (4704132), we get a palindrome (27844872).

The spelling of 23140740 in words is "twenty-three million, one hundred forty thousand, seven hundred forty".