20515453040000 has 160 divisors (see below), whose sum is σ = 51136989519000. Its totient is φ = 8195728896000.

The previous prime is 20515453039999. The next prime is 20515453040011. The reversal of 20515453040000 is 4035451502.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 62797076 + ... + 63122924.

Almost surely, 2^{20515453040000} is an apocalyptic number.

20515453040000 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 20515453040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25568494759500).

20515453040000 is an abundant number, since it is smaller than the sum of its proper divisors (30621536479000).

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

20515453040000 is an frugal number, since it uses more digits than its factorization.

20515453040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326670 (or 326643 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 20515453040000 its reverse (4035451502), we get a palindrome (20519488491502).

The spelling of 20515453040000 in words is "twenty trillion, five hundred fifteen billion, four hundred fifty-three million, forty thousand".