20512324440 has 256 divisors, whose sum is σ = 72538416000. Its totient is φ = 5138104320.

The previous prime is 20512324433. The next prime is 20512324463. The reversal of 20512324440 is 4442321502.

20512324440 is a `hidden beast` number, since 205 + 12 + 3 + 2 + 4 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14852550 + ... + 14853930.

Almost surely, 2^20512324440 is an apocalyptic number.

20512324440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20512324440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36269208000).

20512324440 is an abundant number, since it is smaller than the sum of its proper divisors (52026091560).

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

20512324440 is a wasteful number, since it uses less digits than its factorization.

20512324440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227 (or 2217 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 20512324440 its reverse (4442321502), we get a palindrome (24954645942).

The spelling of 20512324440 in words is "twenty billion, five hundred twelve million, three hundred twenty-four thousand, four hundred forty".