20712824 has 32 divisors (see below), whose sum is σ = 43176240. Its totient is φ = 9235200.

The previous prime is 20712823. The next prime is 20712829. The reversal of 20712824 is 42821702.

It is a junction number, because it is equal to n+sod(n) for n = 20712793 and 20712802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2444 + ... + 6884.

Almost surely, 2^20712824 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20712824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21588120).

20712824 is an abundant number, since it is smaller than the sum of its proper divisors (22463416).

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

20712824 is a wasteful number, since it uses less digits than its factorization.

20712824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511 (or 4507 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20712824 is about 4551.1343640899. The cubic root of 20712824 is about 274.6290270580.

It can be divided in two parts, 207 and 12824, that added together give a palindrome (13031).

The spelling of 20712824 in words is "twenty million, seven hundred twelve thousand, eight hundred twenty-four".