20743824 has 20 divisors (see below), whose sum is σ = 53588336. Its totient is φ = 6914592.

The previous prime is 20743819. The next prime is 20743831. The reversal of 20743824 is 42834702.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20743791 and 20743800.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216034 + ... + 216129.

Almost surely, 2^20743824 is an apocalyptic number.

20743824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20743824 is an abundant number, since it is smaller than the sum of its proper divisors (32844512).

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

20743824 is a wasteful number, since it uses less digits than its factorization.

20743824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432174 (or 432168 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 20743824 is about 4554.5388350523. The cubic root of 20743824 is about 274.7659672793.

The spelling of 20743824 in words is "twenty million, seven hundred forty-three thousand, eight hundred twenty-four".