20118869280 has 144 divisors (see below), whose sum is σ = 69005120184. Its totient is φ = 5337722880.

The previous prime is 20118869263. The next prime is 20118869297. The reversal of 20118869280 is 8296881102.

It is a happy number.

It is a Cunningham number, because it is equal to 141841²-1.

It is an interprime number because it is at equal distance from previous prime (20118869263) and next prime (20118869297).

It can be written as a sum of positive squares in 4 ways, for example, as 19837032336 + 281836944 = 140844^2 + 16788^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×20118869280² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248220 + ... + 319140.

Almost surely, 2^20118869280 is an apocalyptic number.

20118869280 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 20118869280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34502560092).

20118869280 is an abundant number, since it is smaller than the sum of its proper divisors (48886250904).

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

20118869280 is a wasteful number, since it uses less digits than its factorization.

20118869280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71139 (or 71128 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 20118869280 in words is "twenty billion, one hundred eighteen million, eight hundred sixty-nine thousand, two hundred eighty".