420506656 has 12 divisors (see below), whose sum is σ = 827872542. Its totient is φ = 210253312.

The previous prime is 420506633. The next prime is 420506657. The reversal of 420506656 is 656605024.

It can be written as a sum of positive squares in only one way, i.e., 403367056 + 17139600 = 20084^2 + 4140^2 .

It is not an unprimeable number, because it can be changed into a prime (420506657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6570385 + ... + 6570448.

Almost surely, 2^420506656 is an apocalyptic number.

It is an amenable number.

420506656 is a deficient number, since it is larger than the sum of its proper divisors (407365886).

420506656 is a wasteful number, since it uses less digits than its factorization.

420506656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13140843 (or 13140835 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 420506656 is about 20506.2589469654. The cubic root of 420506656 is about 749.1882512170.

The spelling of 420506656 in words is "four hundred twenty million, five hundred six thousand, six hundred fifty-six".