20124451 has 4 divisors (see below), whose sum is σ = 20136600. Its totient is φ = 20112304.

The previous prime is 20124437. The next prime is 20124457. The reversal of 20124451 is 15442102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20124451 - 2⁷ = 20124323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20124457) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3106 + ... + 7063.

It is an arithmetic number, because the mean of its divisors is an integer number (5034150).

Almost surely, 2^20124451 is an apocalyptic number.

20124451 is a deficient number, since it is larger than the sum of its proper divisors (12149).

20124451 is a wasteful number, since it uses less digits than its factorization.

20124451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12148.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20124451 is about 4486.0284216665. The cubic root of 20124451 is about 272.0036178512.

Adding to 20124451 its reverse (15442102), we get a palindrome (35566553).

It can be divided in two parts, 201244 and 51, that added together give a triangular number (201295 = T₆₃₄).

The spelling of 20124451 in words is "twenty million, one hundred twenty-four thousand, four hundred fifty-one".