23390220 has 48 divisors (see below), whose sum is σ = 74850048. Its totient is φ = 5346240.

The previous prime is 23390183. The next prime is 23390221. The reversal of 23390220 is 2209332.

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

It is not an unprimeable number, because it can be changed into a prime (23390221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27426 + ... + 28265.

It is an arithmetic number, because the mean of its divisors is an integer number (1559376).

Almost surely, 2^23390220 is an apocalyptic number.

23390220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23390220 is an abundant number, since it is smaller than the sum of its proper divisors (51459828).

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

23390220 is a wasteful number, since it uses less digits than its factorization.

23390220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55710 (or 55708 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 23390220 is about 4836.3436602458. The cubic root of 23390220 is about 285.9859969997.

Adding to 23390220 its reverse (2209332), we get a palindrome (25599552).

The spelling of 23390220 in words is "twenty-three million, three hundred ninety thousand, two hundred twenty".