23491620 has 120 divisors (see below), whose sum is σ = 78120504. Its totient is φ = 5889024.

The previous prime is 23491613. The next prime is 23491621. The reversal of 23491620 is 2619432.

23491620 is a `hidden beast` number, since 2 + 34 + 9 + 1 + 620 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 910116 + 22581504 = 954^2 + 4752^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (23491621) 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, 27114 + ... + 27966.

Almost surely, 2^23491620 is an apocalyptic number.

23491620 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 23491620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39060252).

23491620 is an abundant number, since it is smaller than the sum of its proper divisors (54628884).

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

23491620 is a wasteful number, since it uses less digits than its factorization.

23491620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 23491620 is about 4846.8154493440. The cubic root of 23491620 is about 286.3986648555.

It can be divided in two parts, 2349 and 1620, that added together give a square (3969 = 63²).

The spelling of 23491620 in words is "twenty-three million, four hundred ninety-one thousand, six hundred twenty".