20278591488 has 120 divisors (see below), whose sum is σ = 60084192560. Its totient is φ = 6759383040.

The previous prime is 20278591387. The next prime is 20278591507. The reversal of 20278591488 is 88419587202.

20278591488 is a `hidden beast` number, since 2 + 0 + 2 + 7 + 8 + 591 + 48 + 8 = 666.

It is a super-2 number, since 2×20278591488² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419448 + ... + 465288.

Almost surely, 2^20278591488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20278591488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30042096280).

20278591488 is an abundant number, since it is smaller than the sum of its proper divisors (39805601072).

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

20278591488 is an frugal number, since it uses more digits than its factorization.

20278591488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45878 (or 45846 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 20278591488 in words is "twenty billion, two hundred seventy-eight million, five hundred ninety-one thousand, four hundred eighty-eight".