1215445240020 has 192 divisors, whose sum is σ = 3782333076480. Its totient is φ = 289139558400.

The previous prime is 1215445240013. The next prime is 1215445240091. The reversal of 1215445240020 is 200425445121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 1215445240020.

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, 21895500 + ... + 21950940.

It is an arithmetic number, because the mean of its divisors is an integer number (19699651440).

Almost surely, 2^{1215445240020} is an apocalyptic number.

1215445240020 is a gapful number since it is divisible by the number (10) 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 1215445240020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1891166538240).

1215445240020 is an abundant number, since it is smaller than the sum of its proper divisors (2566887836460).

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

1215445240020 is a wasteful number, since it uses less digits than its factorization.

1215445240020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56086 (or 56084 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The spelling of 1215445240020 in words is "one trillion, two hundred fifteen billion, four hundred forty-five million, two hundred forty thousand, twenty".