20860279440 has 640 divisors, whose sum is σ = 89658261504. Its totient is φ = 3870720000.

The previous prime is 20860279439. The next prime is 20860279477. The reversal of 20860279440 is 4497206802.

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

It is a junction number, because it is equal to n+sod(n) for n = 20860279392 and 20860279401.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7446040 + ... + 7448840.

Almost surely, 2^20860279440 is an apocalyptic number.

20860279440 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 20860279440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44829130752).

20860279440 is an abundant number, since it is smaller than the sum of its proper divisors (68797982064).

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

20860279440 is a wasteful number, since it uses less digits than its factorization.

20860279440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879 (or 2873 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 20860279440 in words is "twenty billion, eight hundred sixty million, two hundred seventy-nine thousand, four hundred forty".