20431425 has 24 divisors (see below), whose sum is σ = 38606656. Its totient is φ = 9339840.

The previous prime is 20431423. The next prime is 20431427. The reversal of 20431425 is 52413402.

It is an interprime number because it is at equal distance from previous prime (20431423) and next prime (20431427).

It is not a de Polignac number, because 20431425 - 2¹ = 20431423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20431421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18934 + ... + 19983.

Almost surely, 2^20431425 is an apocalyptic number.

20431425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20431425 is a deficient number, since it is larger than the sum of its proper divisors (18175231).

20431425 is a wasteful number, since it uses less digits than its factorization.

20431425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38937 (or 38932 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20431425 is about 4520.1133835336. The cubic root of 20431425 is about 273.3796727238.

Adding to 20431425 its reverse (52413402), we get a palindrome (72844827).

The spelling of 20431425 in words is "twenty million, four hundred thirty-one thousand, four hundred twenty-five".