420660505 has 16 divisors (see below), whose sum is σ = 513541440. Its totient is φ = 330720192.

The previous prime is 420660503. The next prime is 420660509. The reversal of 420660505 is 505066024.

It is a cyclic number.

It is not a de Polignac number, because 420660505 - 2¹ = 420660503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420660503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169282 + ... + 171748.

It is an arithmetic number, because the mean of its divisors is an integer number (32096340).

Almost surely, 2^420660505 is an apocalyptic number.

It is an amenable number.

420660505 is a deficient number, since it is larger than the sum of its proper divisors (92880935).

420660505 is a wasteful number, since it uses less digits than its factorization.

420660505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3048.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 420660505 is about 20510.0098732302. The cubic root of 420660505 is about 749.2796075271.

The spelling of 420660505 in words is "four hundred twenty million, six hundred sixty thousand, five hundred five".