20431401224 has 32 divisors (see below), whose sum is σ = 41954976000. Its totient is φ = 9270046272.

The previous prime is 20431401223. The next prime is 20431401241. The reversal of 20431401224 is 42210413402.

It is a self number, because there is not a number n which added to its sum of digits gives 20431401224.

It is not an unprimeable number, because it can be changed into a prime (20431401223) 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, 1658744 + ... + 1671015.

It is an arithmetic number, because the mean of its divisors is an integer number (1311093000).

Almost surely, 2^20431401224 is an apocalyptic number.

It is an amenable number.

20431401224 is an abundant number, since it is smaller than the sum of its proper divisors (21523574776).

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

20431401224 is a wasteful number, since it uses less digits than its factorization.

20431401224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329837 (or 3329833 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 20431401224 its reverse (42210413402), we get a palindrome (62641814626).

The spelling of 20431401224 in words is "twenty billion, four hundred thirty-one million, four hundred one thousand, two hundred twenty-four".