20400023224 has 32 divisors (see below), whose sum is σ = 43751121120. Its totient is φ = 8735510016.

The previous prime is 20400023221. The next prime is 20400023251. The reversal of 20400023224 is 42232000402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400023221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85869 + ... + 219484.

It is an arithmetic number, because the mean of its divisors is an integer number (1367222535).

Almost surely, 2^20400023224 is an apocalyptic number.

It is an amenable number.

20400023224 is an abundant number, since it is smaller than the sum of its proper divisors (23351097896).

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

20400023224 is a wasteful number, since it uses less digits than its factorization.

20400023224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306559 (or 306555 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

Adding to 20400023224 its reverse (42232000402), we get a palindrome (62632023626).

The spelling of 20400023224 in words is "twenty billion, four hundred million, twenty-three thousand, two hundred twenty-four".