20713224 has 64 divisors (see below), whose sum is σ = 59673600. Its totient is φ = 5868864.

The previous prime is 20713219. The next prime is 20713243. The reversal of 20713224 is 42231702.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20713224.

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, 22909 + ... + 23795.

It is an arithmetic number, because the mean of its divisors is an integer number (932400).

Almost surely, 2^20713224 is an apocalyptic number.

20713224 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 20713224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29836800).

20713224 is an abundant number, since it is smaller than the sum of its proper divisors (38960376).

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

20713224 is a wasteful number, since it uses less digits than its factorization.

20713224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20713224 is about 4551.1783089657. The cubic root of 20713224 is about 274.6307948985.

Adding to 20713224 its reverse (42231702), we get a palindrome (62944926).

It can be divided in two parts, 207 and 13224, that added together give a palindrome (13431).

The spelling of 20713224 in words is "twenty million, seven hundred thirteen thousand, two hundred twenty-four".