40420020020 has 12 divisors (see below), whose sum is σ = 84882042084. Its totient is φ = 16168008000.

The previous prime is 40420019977. The next prime is 40420020023. The reversal of 40420020020 is 2002002404.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 29538609424 + 10881410596 = 171868^2 + 104314^2 .

It is a hoax number, since the sum of its digits (14) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 40420019977 and 40420020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40420020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010500481 + ... + 1010500520.

It is an arithmetic number, because the mean of its divisors is an integer number (7073503507).

Almost surely, 2^40420020020 is an apocalyptic number.

It is an amenable number.

40420020020 is an abundant number, since it is smaller than the sum of its proper divisors (44462022064).

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

40420020020 is a wasteful number, since it uses less digits than its factorization.

40420020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021001010 (or 2021001008 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

Adding to 40420020020 its reverse (2002002404), we get a palindrome (42422022424).

The spelling of 40420020020 in words is "forty billion, four hundred twenty million, twenty thousand, twenty".