20431230 has 16 divisors (see below), whose sum is σ = 49035024. Its totient is φ = 5448320.

The previous prime is 20431223. The next prime is 20431237. The reversal of 20431230 is 3213402.

It is an interprime number because it is at equal distance from previous prime (20431223) and next prime (20431237).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340491 + ... + 340550.

It is an arithmetic number, because the mean of its divisors is an integer number (3064689).

Almost surely, 2^20431230 is an apocalyptic number.

20431230 is an abundant number, since it is smaller than the sum of its proper divisors (28603794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20431230 is a wasteful number, since it uses less digits than its factorization.

20431230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681051.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20431230 is about 4520.0918132268. The cubic root of 20431230 is about 273.3788029981.

Adding to 20431230 its reverse (3213402), we get a palindrome (23644632).

The spelling of 20431230 in words is "twenty million, four hundred thirty-one thousand, two hundred thirty".