20479019040 has 144 divisors (see below), whose sum is σ = 69927615576. Its totient is φ = 5457715200.

The previous prime is 20479018997. The next prime is 20479019053. The reversal of 20479019040 is 4091097402.

It can be written as a sum of positive squares in 4 ways, for example, as 15126048144 + 5352970896 = 122988^2 + 73164^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20479018986 and 20479019004.

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, 3108550 + ... + 3115130.

Almost surely, 2^20479019040 is an apocalyptic number.

20479019040 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 20479019040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34963807788).

20479019040 is an abundant number, since it is smaller than the sum of its proper divisors (49448596536).

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

20479019040 is a wasteful number, since it uses less digits than its factorization.

20479019040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8763 (or 8752 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 20479019040 in words is "twenty billion, four hundred seventy-nine million, nineteen thousand, forty".