20671224 has 64 divisors (see below), whose sum is σ = 59927040. Its totient is φ = 5819520.

The previous prime is 20671213. The next prime is 20671241. The reversal of 20671224 is 42217602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20671194 and 20671203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11062 + ... + 12794.

It is an arithmetic number, because the mean of its divisors is an integer number (936360).

Almost surely, 2^20671224 is an apocalyptic number.

20671224 is a gapful number since it is divisible by the number (24) 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 20671224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29963520).

20671224 is an abundant number, since it is smaller than the sum of its proper divisors (39255816).

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

20671224 is a wasteful number, since it uses less digits than its factorization.

20671224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820 (or 1816 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20671224 is about 4546.5617778713. The cubic root of 20671224 is about 274.4450472443.

Adding to 20671224 its reverse (42217602), we get a palindrome (62888826).

The spelling of 20671224 in words is "twenty million, six hundred seventy-one thousand, two hundred twenty-four".