2021820040 has 16 divisors (see below), whose sum is σ = 4549095180. Its totient is φ = 808728000.

The previous prime is 2021820023. The next prime is 2021820041. The reversal of 2021820040 is 400281202.

It can be written as a sum of positive squares in 2 ways, for example, as 2003994756 + 17825284 = 44766^2 + 4222^2 .

It is not an unprimeable number, because it can be changed into a prime (2021820041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25272711 + ... + 25272790.

Almost surely, 2^2021820040 is an apocalyptic number.

2021820040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021820040 is an abundant number, since it is smaller than the sum of its proper divisors (2527275140).

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

2021820040 is a wasteful number, since it uses less digits than its factorization.

2021820040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50545512 (or 50545508 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 2021820040 is about 44964.6532289531. The cubic root of 2021820040 is about 1264.4864084956.

The spelling of 2021820040 in words is "two billion, twenty-one million, eight hundred twenty thousand, forty".