23218020 has 72 divisors (see below), whose sum is σ = 80493504. Its totient is φ = 5306688.

The previous prime is 23218001. The next prime is 23218043. The reversal of 23218020 is 2081232.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 23217984 and 23218002.

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 23 ways as a sum of consecutive naturals, for example, 7954 + ... + 10473.

Almost surely, 2^23218020 is an apocalyptic number.

23218020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23218020 is an abundant number, since it is smaller than the sum of its proper divisors (57275484).

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

23218020 is a wasteful number, since it uses less digits than its factorization.

23218020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18449 (or 18444 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 23218020 is about 4818.5080678567. The cubic root of 23218020 is about 285.2824531272.

Adding to 23218020 its reverse (2081232), we get a palindrome (25299252).

The spelling of 23218020 in words is "twenty-three million, two hundred eighteen thousand, twenty".