20443431 has 16 divisors (see below), whose sum is σ = 27813344. Its totient is φ = 13353984.

The previous prime is 20443417. The next prime is 20443433. The reversal of 20443431 is 13434402.

It is not a de Polignac number, because 20443431 - 2¹⁷ = 20312359 is a prime.

It is a super-2 number, since 2×20443431² = 835867742103522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20443398 and 20443407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60495 + ... + 60831.

It is an arithmetic number, because the mean of its divisors is an integer number (1738334).

Almost surely, 2^20443431 is an apocalyptic number.

20443431 is a deficient number, since it is larger than the sum of its proper divisors (7369913).

20443431 is a wasteful number, since it uses less digits than its factorization.

20443431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20443431 is about 4521.4412525211. The cubic root of 20443431 is about 273.4332104100.

Adding to 20443431 its reverse (13434402), we get a palindrome (33877833).

The spelling of 20443431 in words is "twenty million, four hundred forty-three thousand, four hundred thirty-one".