20124431 has 4 divisors (see below), whose sum is σ = 20167992. Its totient is φ = 20080872.

The previous prime is 20124409. The next prime is 20124437. The reversal of 20124431 is 13442102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13442102 = 2 ⋅6721051.

It is a cyclic number.

It is not a de Polignac number, because 20124431 - 2¹⁸ = 19862287 is a prime.

It is a super-3 number, since 3×20124431³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20124437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21080 + ... + 22013.

It is an arithmetic number, because the mean of its divisors is an integer number (5041998).

Almost surely, 2^20124431 is an apocalyptic number.

20124431 is a deficient number, since it is larger than the sum of its proper divisors (43561).

20124431 is an equidigital number, since it uses as much as digits as its factorization.

20124431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43560.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20124431 is about 4486.0261925227. The cubic root of 20124431 is about 272.0035277440.

Adding to 20124431 its reverse (13442102), we get a palindrome (33566533).

The spelling of 20124431 in words is "twenty million, one hundred twenty-four thousand, four hundred thirty-one".