406642020 has 24 divisors (see below), whose sum is σ = 1138597824. Its totient is φ = 108437856.

The previous prime is 406641959. The next prime is 406642087. The reversal of 406642020 is 20246604.

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, 3388624 + ... + 3388743.

It is an arithmetic number, because the mean of its divisors is an integer number (47441576).

Almost surely, 2^406642020 is an apocalyptic number.

It is an amenable number.

406642020 is an abundant number, since it is smaller than the sum of its proper divisors (731955804).

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

406642020 is a wasteful number, since it uses less digits than its factorization.

406642020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6777379 (or 6777377 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 406642020 is about 20165.3668451630. The cubic root of 406642020 is about 740.8621677376.

Adding to 406642020 its reverse (20246604), we get a palindrome (426888624).

The spelling of 406642020 in words is "four hundred six million, six hundred forty-two thousand, twenty".