20106431 has 4 divisors (see below), whose sum is σ = 20166432. Its totient is φ = 20046432.

The previous prime is 20106421. The next prime is 20106469. The reversal of 20106431 is 13460102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13460102 = 2 ⋅6730051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20106431 is a prime.

It is a super-2 number, since 2×20106431² = 808537135115522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20106421) 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, 29495 + ... + 30168.

It is an arithmetic number, because the mean of its divisors is an integer number (5041608).

Almost surely, 2^20106431 is an apocalyptic number.

20106431 is a deficient number, since it is larger than the sum of its proper divisors (60001).

20106431 is an equidigital number, since it uses as much as digits as its factorization.

20106431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60000.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20106431 is about 4484.0195137845. The cubic root of 20106431 is about 271.9224070412.

Adding to 20106431 its reverse (13460102), we get a palindrome (33566533).

The spelling of 20106431 in words is "twenty million, one hundred six thousand, four hundred thirty-one".