20305224 has 48 divisors (see below), whose sum is σ = 57891600. Its totient is φ = 6411744.

The previous prime is 20305213. The next prime is 20305231. The reversal of 20305224 is 42250302.

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 = 20305197 and 20305206.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6054 + ... + 8789.

It is an arithmetic number, because the mean of its divisors is an integer number (1206075).

Almost surely, 2^20305224 is an apocalyptic number.

20305224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20305224 is an abundant number, since it is smaller than the sum of its proper divisors (37586376).

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

20305224 is a wasteful number, since it uses less digits than its factorization.

20305224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14874 (or 14867 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20305224 is about 4506.1318223061. The cubic root of 20305224 is about 272.8156385172.

Adding to 20305224 its reverse (42250302), we get a palindrome (62555526).

The spelling of 20305224 in words is "twenty million, three hundred five thousand, two hundred twenty-four".