23445720 has 128 divisors (see below), whose sum is σ = 82814400. Its totient is φ = 5879808.

The previous prime is 23445713. The next prime is 23445731. The reversal of 23445720 is 2754432.

23445720 = T₇₂₀ + T₇₂₁ + ... + T₈₀₀.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17722 + ... + 18998.

Almost surely, 2^23445720 is an apocalyptic number.

23445720 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 23445720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41407200).

23445720 is an abundant number, since it is smaller than the sum of its proper divisors (59368680).

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

23445720 is a wasteful number, since it uses less digits than its factorization.

23445720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314 (or 1304 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 23445720 is about 4842.0780662852. The cubic root of 23445720 is about 286.2120129094.

It can be divided in two parts, 234 and 45720, that added together give a palindrome (45954).

The spelling of 23445720 in words is "twenty-three million, four hundred forty-five thousand, seven hundred twenty".