40020420 has 48 divisors (see below), whose sum is σ = 122246208. Its totient is φ = 9701760.

The previous prime is 40020389. The next prime is 40020433. The reversal of 40020420 is 2402004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 40020396 and 40020405.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 29659 + ... + 30978.

It is an arithmetic number, because the mean of its divisors is an integer number (2546796).

Almost surely, 2^40020420 is an apocalyptic number.

It is an amenable number.

40020420 is an abundant number, since it is smaller than the sum of its proper divisors (82225788).

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

40020420 is a wasteful number, since it uses less digits than its factorization.

40020420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60660 (or 60658 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 40020420 is about 6326.1694571044. The cubic root of 40020420 is about 342.0533756165.

Adding to 40020420 its reverse (2402004), we get a palindrome (42422424).

The spelling of 40020420 in words is "forty million, twenty thousand, four hundred twenty".