231224420 has 48 divisors (see below), whose sum is σ = 568487808. Its totient is φ = 77341440.

The previous prime is 231224407. The next prime is 231224431. The reversal of 231224420 is 24422132.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 231224392 and 231224401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14402 + ... + 25881.

It is an arithmetic number, because the mean of its divisors is an integer number (11843496).

Almost surely, 2^231224420 is an apocalyptic number.

231224420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231224420 is an abundant number, since it is smaller than the sum of its proper divisors (337263388).

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

231224420 is a wasteful number, since it uses less digits than its factorization.

231224420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40340 (or 40338 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 231224420 is about 15206.0652372663. The cubic root of 231224420 is about 613.7778801648. Note that the first 3 decimals are identical.

Adding to 231224420 its reverse (24422132), we get a palindrome (255646552).

The spelling of 231224420 in words is "two hundred thirty-one million, two hundred twenty-four thousand, four hundred twenty".