4020404420 has 24 divisors (see below), whose sum is σ = 8499519000. Its totient is φ = 1597367552.

The previous prime is 4020404419. The next prime is 4020404431. The reversal of 4020404420 is 244040204.

It can be written as a sum of positive squares in 4 ways, for example, as 114404416 + 3906000004 = 10696^2 + 62498^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 4020404392 and 4020404401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671585 + ... + 677544.

It is an arithmetic number, because the mean of its divisors is an integer number (354146625).

Almost surely, 2^4020404420 is an apocalyptic number.

It is an amenable number.

4020404420 is an abundant number, since it is smaller than the sum of its proper divisors (4479114580).

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

4020404420 is a wasteful number, since it uses less digits than its factorization.

4020404420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349287 (or 1349285 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 4020404420 is about 63406.6591140079. The cubic root of 4020404420 is about 1590.0956418346.

Adding to 4020404420 its reverse (244040204), we get a palindrome (4264444624).

The spelling of 4020404420 in words is "four billion, twenty million, four hundred four thousand, four hundred twenty".