20531440545440 has 192 divisors, whose sum is σ = 53960318633088. Its totient is φ = 7319946854400.

The previous prime is 20531440545433. The next prime is 20531440545461. The reversal of 20531440545440 is 4454504413502.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17705060 + ... + 18829020.

It is an arithmetic number, because the mean of its divisors is an integer number (281043326214).

Almost surely, 2^{20531440545440} is an apocalyptic number.

20531440545440 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 20531440545440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26980159316544).

20531440545440 is an abundant number, since it is smaller than the sum of its proper divisors (33428878087648).

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

20531440545440 is a wasteful number, since it uses less digits than its factorization.

20531440545440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124191 (or 1124183 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 41.

Adding to 20531440545440 its reverse (4454504413502), we get a palindrome (24985944958942).

The spelling of 20531440545440 in words is "twenty trillion, five hundred thirty-one billion, four hundred forty million, five hundred forty-five thousand, four hundred forty".