20321412440 has 64 divisors (see below), whose sum is σ = 54056980800. Its totient is φ = 6727085568.

The previous prime is 20321412337. The next prime is 20321412491. The reversal of 20321412440 is 4421412302.

It is a congruent number.

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, 1243199 + ... + 1259438.

It is an arithmetic number, because the mean of its divisors is an integer number (844640325).

Almost surely, 2^20321412440 is an apocalyptic number.

20321412440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321412440 is an abundant number, since it is smaller than the sum of its proper divisors (33735568360).

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

20321412440 is a wasteful number, since it uses less digits than its factorization.

20321412440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502684 (or 2502680 counting only the distinct ones).

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

Adding to 20321412440 its reverse (4421412302), we get a palindrome (24742824742).

The spelling of 20321412440 in words is "twenty billion, three hundred twenty-one million, four hundred twelve thousand, four hundred forty".