20860918240 has 96 divisors (see below), whose sum is σ = 49602085344. Its totient is φ = 8290713600.

The previous prime is 20860918231. The next prime is 20860918241. The reversal of 20860918240 is 4281906802.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 20860918193 and 20860918202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20860918241) 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 15 ways as a sum of consecutive naturals, for example, 22263052 + ... + 22263988.

It is an arithmetic number, because the mean of its divisors is an integer number (516688389).

Almost surely, 2^20860918240 is an apocalyptic number.

20860918240 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 20860918240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24801042672).

20860918240 is an abundant number, since it is smaller than the sum of its proper divisors (28741167104).

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

20860918240 is a wasteful number, since it uses less digits than its factorization.

20860918240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700 (or 1692 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 20860918240 in words is "twenty billion, eight hundred sixty million, nine hundred eighteen thousand, two hundred forty".