24172020 has 120 divisors (see below), whose sum is σ = 77815584. Its totient is φ = 6277824.

The previous prime is 24171991. The next prime is 24172039. The reversal of 24172020 is 2027142.

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 = 24171984 and 24172002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 69487 + ... + 69833.

Almost surely, 2^24172020 is an apocalyptic number.

24172020 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 24172020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38907792).

24172020 is an abundant number, since it is smaller than the sum of its proper divisors (53643564).

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

24172020 is a wasteful number, since it uses less digits than its factorization.

24172020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 24172020 is about 4916.5048560944. The cubic root of 24172020 is about 289.1374290003.

Adding to 24172020 its reverse (2027142), we get a palindrome (26199162).

The spelling of 24172020 in words is "twenty-four million, one hundred seventy-two thousand, twenty".