23420720 has 20 divisors (see below), whose sum is σ = 54453360. Its totient is φ = 9368256.

The previous prime is 23420689. The next prime is 23420729. The reversal of 23420720 is 2702432.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

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

It is a junction number, because it is equal to n+sod(n) for n = 23420692 and 23420701.

It is not an unprimeable number, because it can be changed into a prime (23420729) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 146300 + ... + 146459.

It is an arithmetic number, because the mean of its divisors is an integer number (2722668).

Almost surely, 2^23420720 is an apocalyptic number.

23420720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23420720 is an abundant number, since it is smaller than the sum of its proper divisors (31032640).

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

23420720 is a wasteful number, since it uses less digits than its factorization.

23420720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292772 (or 292766 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 23420720 is about 4839.4958415108. The cubic root of 23420720 is about 286.1102481375.

The spelling of 23420720 in words is "twenty-three million, four hundred twenty thousand, seven hundred twenty".