20431006 has 4 divisors (see below), whose sum is σ = 30646512. Its totient is φ = 10215502.

The previous prime is 20431003. The next prime is 20431007. The reversal of 20431006 is 60013402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60013402 = 2 ⋅30006701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5107750 + ... + 5107753.

It is an arithmetic number, because the mean of its divisors is an integer number (7661628).

Almost surely, 2^20431006 is an apocalyptic number.

20431006 is a deficient number, since it is larger than the sum of its proper divisors (10215506).

20431006 is a wasteful number, since it uses less digits than its factorization.

20431006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10215505.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20431006 is about 4520.0670349011. The cubic root of 20431006 is about 273.3778039217.

Adding to 20431006 its reverse (60013402), we get a palindrome (80444408).

The spelling of 20431006 in words is "twenty million, four hundred thirty-one thousand, six".