23151420 has 120 divisors (see below), whose sum is σ = 75132288. Its totient is φ = 5961600.

The previous prime is 23151419. The next prime is 23151421. The reversal of 23151420 is 2415132.

It is an interprime number because it is at equal distance from previous prime (23151419) and next prime (23151421).

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 = 23151393 and 23151402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23151421) 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 39 ways as a sum of consecutive naturals, for example, 49990 + ... + 50450.

Almost surely, 2^23151420 is an apocalyptic number.

23151420 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 23151420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37566144).

23151420 is an abundant number, since it is smaller than the sum of its proper divisors (51980868).

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

23151420 is a wasteful number, since it uses less digits than its factorization.

23151420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 23151420 is about 4811.5922520513. The cubic root of 23151420 is about 285.0094179713.

Adding to 23151420 its reverse (2415132), we get a palindrome (25566552).

The spelling of 23151420 in words is "twenty-three million, one hundred fifty-one thousand, four hundred twenty".