620980 has 24 divisors (see below), whose sum is σ = 1328040. Its totient is φ = 243840.

The previous prime is 620957. The next prime is 620981. The reversal of 620980 is 89026.

It can be written as a sum of positive squares in 4 ways, for example, as 21904 + 599076 = 148^2 + 774^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620981) by changing a digit.

620980 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 966 + ... + 1474.

It is an arithmetic number, because the mean of its divisors is an integer number (55335).

2⁶²⁰⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

620980 is an abundant number, since it is smaller than the sum of its proper divisors (707060).

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

620980 is a wasteful number, since it uses less digits than its factorization.

620980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 620980 is about 788.0228423085. The cubic root of 620980 is about 85.3150934865.

It can be divided in two parts, 620 and 980, that added together give a square (1600 = 40²).

The spelling of 620980 in words is "six hundred twenty thousand, nine hundred eighty".