23121620 has 24 divisors (see below), whose sum is σ = 48943104. Its totient is φ = 9174816.

The previous prime is 23121617. The next prime is 23121643. The reversal of 23121620 is 2612132.

It is a super-2 number, since 2×23121620² = 1069218622848800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2012 + ... + 7091.

It is an arithmetic number, because the mean of its divisors is an integer number (2039296).

Almost surely, 2^23121620 is an apocalyptic number.

23121620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23121620 is an abundant number, since it is smaller than the sum of its proper divisors (25821484).

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

23121620 is a wasteful number, since it uses less digits than its factorization.

23121620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9239 (or 9237 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 23121620 is about 4808.4945669097. The cubic root of 23121620 is about 284.8870795088.

Adding to 23121620 its reverse (2612132), we get a palindrome (25733752).

The spelling of 23121620 in words is "twenty-three million, one hundred twenty-one thousand, six hundred twenty".