20515221051040 has 96 divisors (see below), whose sum is σ = 49197890294784. Its totient is φ = 8082411617280.

The previous prime is 20515221050971. The next prime is 20515221051043. The reversal of 20515221051040 is 4015012251502.

It is not an unprimeable number, because it can be changed into a prime (20515221051043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74011905 + ... + 74288575.

It is an arithmetic number, because the mean of its divisors is an integer number (512478023904).

Almost surely, 2^{20515221051040} is an apocalyptic number.

20515221051040 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 20515221051040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24598945147392).

20515221051040 is an abundant number, since it is smaller than the sum of its proper divisors (28682669243744).

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

20515221051040 is a wasteful number, since it uses less digits than its factorization.

20515221051040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283670 (or 283662 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 20515221051040 in words is "twenty trillion, five hundred fifteen billion, two hundred twenty-one million, fifty-one thousand, forty".