20115213144 has 128 divisors (see below), whose sum is σ = 58314816000. Its totient is φ = 5726398464.

The previous prime is 20115213143. The next prime is 20115213191. The reversal of 20115213144 is 44131251102.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115213143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 280797 + ... + 345075.

It is an arithmetic number, because the mean of its divisors is an integer number (455584500).

Almost surely, 2^20115213144 is an apocalyptic number.

20115213144 is a gapful number since it is divisible by the number (24) 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 20115213144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29157408000).

20115213144 is an abundant number, since it is smaller than the sum of its proper divisors (38199602856).

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

20115213144 is a wasteful number, since it uses less digits than its factorization.

20115213144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64377 (or 64373 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 20115213144 its reverse (44131251102), we get a palindrome (64246464246).

The spelling of 20115213144 in words is "twenty billion, one hundred fifteen million, two hundred thirteen thousand, one hundred forty-four".