23217140 has 24 divisors (see below), whose sum is σ = 50330112. Its totient is φ = 8987040.

The previous prime is 23217133. The next prime is 23217151. The reversal of 23217140 is 4171232.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 18104 + ... + 19343.

It is an arithmetic number, because the mean of its divisors is an integer number (2097088).

Almost surely, 2^23217140 is an apocalyptic number.

23217140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23217140 is an abundant number, since it is smaller than the sum of its proper divisors (27112972).

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

23217140 is a wasteful number, since it uses less digits than its factorization.

23217140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37487 (or 37485 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 23217140 is about 4818.4167524198. The cubic root of 23217140 is about 285.2788488616.

Adding to 23217140 its reverse (4171232), we get a palindrome (27388372).

The spelling of 23217140 in words is "twenty-three million, two hundred seventeen thousand, one hundred forty".