1620005620 has 24 divisors (see below), whose sum is σ = 3443003424. Its totient is φ = 640194336.

The previous prime is 1620005617. The next prime is 1620005623. The reversal of 1620005620 is 265000261.

It is an interprime number because it is at equal distance from previous prime (1620005617) and next prime (1620005623).

It is a junction number, because it is equal to n+sod(n) for n = 1620005591 and 1620005600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620005623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486294 + ... + 489613.

It is an arithmetic number, because the mean of its divisors is an integer number (143458476).

Almost surely, 2^1620005620 is an apocalyptic number.

1620005620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620005620 is an abundant number, since it is smaller than the sum of its proper divisors (1822997804).

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

1620005620 is a wasteful number, since it uses less digits than its factorization.

1620005620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975999 (or 975997 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1620005620 is about 40249.2934099470. The cubic root of 1620005620 is about 1174.4616504698.

Adding to 1620005620 its reverse (265000261), we get a palindrome (1885005881).

The spelling of 1620005620 in words is "one billion, six hundred twenty million, five thousand, six hundred twenty".