20426231 has 24 divisors (see below), whose sum is σ = 25935360. Its totient is φ = 15725952.

The previous prime is 20426209. The next prime is 20426233. The reversal of 20426231 is 13262402.

It is not a de Polignac number, because 20426231 - 2⁶ = 20426167 is a prime.

It is a super-2 number, since 2×20426231² = 834461825730722, 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 (20426233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46310 + ... + 46748.

It is an arithmetic number, because the mean of its divisors is an integer number (1080640).

Almost surely, 2^20426231 is an apocalyptic number.

20426231 is a deficient number, since it is larger than the sum of its proper divisors (5509129).

20426231 is a wasteful number, since it uses less digits than its factorization.

20426231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20426231 is about 4519.5388039047. The cubic root of 20426231 is about 273.3565049098.

Adding to 20426231 its reverse (13262402), we get a palindrome (33688633).

The spelling of 20426231 in words is "twenty million, four hundred twenty-six thousand, two hundred thirty-one".