20115494448 has 160 divisors (see below), whose sum is σ = 60289474560. Its totient is φ = 5660478720.

The previous prime is 20115494447. The next prime is 20115494479. The reversal of 20115494448 is 84449451102.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (20115494447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15580683 + ... + 15581973.

It is an arithmetic number, because the mean of its divisors is an integer number (376809216).

Almost surely, 2^20115494448 is an apocalyptic number.

20115494448 is a gapful number since it is divisible by the number (28) 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 20115494448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30144737280).

20115494448 is an abundant number, since it is smaller than the sum of its proper divisors (40173980112).

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

20115494448 is a wasteful number, since it uses less digits than its factorization.

20115494448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975 (or 1969 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 20115494448 in words is "twenty billion, one hundred fifteen million, four hundred ninety-four thousand, four hundred forty-eight".