4020401820 has 24 divisors (see below), whose sum is σ = 11257125264. Its totient is φ = 1072107136.

The previous prime is 4020401813. The next prime is 4020401849. The reversal of 4020401820 is 281040204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33503289 + ... + 33503408.

It is an arithmetic number, because the mean of its divisors is an integer number (469046886).

Almost surely, 2^4020401820 is an apocalyptic number.

It is an amenable number.

4020401820 is an abundant number, since it is smaller than the sum of its proper divisors (7236723444).

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

4020401820 is a wasteful number, since it uses less digits than its factorization.

4020401820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67006709 (or 67006707 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 4020401820 is about 63406.6386114262. The cubic root of 4020401820 is about 1590.0952990623.

The spelling of 4020401820 in words is "four billion, twenty million, four hundred one thousand, eight hundred twenty".