620405305 has 16 divisors (see below), whose sum is σ = 803935440. Its totient is φ = 456899328.

The previous prime is 620405273. The next prime is 620405321. The reversal of 620405305 is 503504026.

620405305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 46656 + 620358649 = 216^2 + 24907^2 .

It is a cyclic number.

It is not a de Polignac number, because 620405305 - 2⁵ = 620405273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 620405305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11451 + ... + 37039.

It is an arithmetic number, because the mean of its divisors is an integer number (50245965).

Almost surely, 2^620405305 is an apocalyptic number.

620405305 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

620405305 is a deficient number, since it is larger than the sum of its proper divisors (183530135).

620405305 is a wasteful number, since it uses less digits than its factorization.

620405305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25980.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 620405305 is about 24907.9365865581. The cubic root of 620405305 is about 852.8876666405.

The spelling of 620405305 in words is "six hundred twenty million, four hundred five thousand, three hundred five".