20542224 has 40 divisors (see below), whose sum is σ = 53291232. Its totient is φ = 6818560.

The previous prime is 20542213. The next prime is 20542253. The reversal of 20542224 is 42224502.

It is a self number, because there is not a number n which added to its sum of digits gives 20542224.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12727 + ... + 14249.

Almost surely, 2^20542224 is an apocalyptic number.

20542224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20542224 is an abundant number, since it is smaller than the sum of its proper divisors (32749008).

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

20542224 is a wasteful number, since it uses less digits than its factorization.

20542224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815 (or 1809 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20542224 is about 4532.3530312631. The cubic root of 20542224 is about 273.8729586702.

Adding to 20542224 its reverse (42224502), we get a palindrome (62766726).

It can be divided in two parts, 2054 and 2224, that added together give a triangular number (4278 = T₉₂).

The spelling of 20542224 in words is "twenty million, five hundred forty-two thousand, two hundred twenty-four".