620861220 has 96 divisors (see below), whose sum is σ = 2207520000. Its totient is φ = 141910272.

The previous prime is 620861209. The next prime is 620861249. The reversal of 620861220 is 22168026.

620861220 is a `hidden beast` number, since 6 + 20 + 8 + 612 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable 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 31 ways as a sum of consecutive naturals, for example, 78345 + ... + 85904.

It is an arithmetic number, because the mean of its divisors is an integer number (22995000).

Almost surely, 2^620861220 is an apocalyptic number.

620861220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

620861220 is an abundant number, since it is smaller than the sum of its proper divisors (1586658780).

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

620861220 is a wasteful number, since it uses less digits than its factorization.

620861220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164274 (or 164266 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 620861220 is about 24917.0869083848. The cubic root of 620861220 is about 853.0965349759.

The spelling of 620861220 in words is "six hundred twenty million, eight hundred sixty-one thousand, two hundred twenty".