620291920 has 80 divisors (see below), whose sum is σ = 1552253328. Its totient is φ = 229662720.

The previous prime is 620291891. The next prime is 620291921. The reversal of 620291920 is 29192026.

620291920 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 2471184 + 617820736 = 1572^2 + 24856^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620291921) 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, 79222 + ... + 86698.

Almost surely, 2^620291920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620291920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776126664).

620291920 is an abundant number, since it is smaller than the sum of its proper divisors (931961408).

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

620291920 is a wasteful number, since it uses less digits than its factorization.

620291920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7568 (or 7562 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 620291920 is about 24905.6604008005. The cubic root of 620291920 is about 852.8357056836.

The spelling of 620291920 in words is "six hundred twenty million, two hundred ninety-one thousand, nine hundred twenty".