23400020 has 72 divisors (see below), whose sum is σ = 59399424. Its totient is φ = 7584192.

The previous prime is 23399953. The next prime is 23400023. The reversal of 23400020 is 2000432.

It is a junction number, because it is equal to n+sod(n) for n = 23399974 and 23400010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23400023) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 50309 + ... + 50771.

It is an arithmetic number, because the mean of its divisors is an integer number (824992).

Almost surely, 2^23400020 is an apocalyptic number.

23400020 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 23400020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29699712).

23400020 is an abundant number, since it is smaller than the sum of its proper divisors (35999404).

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

23400020 is a wasteful number, since it uses less digits than its factorization.

23400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 23400020 is about 4837.3567162243. The cubic root of 23400020 is about 286.0259320871.

Adding to 23400020 its reverse (2000432), we get a palindrome (25400452).

The spelling of 23400020 in words is "twenty-three million, four hundred thousand, twenty".