1620973932820 has 24 divisors (see below), whose sum is σ = 3713503919328. Its totient is φ = 589445066400.

The previous prime is 1620973932817. The next prime is 1620973932839. The reversal of 1620973932820 is 282393790261.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3684031446 + ... + 3684031885.

It is an arithmetic number, because the mean of its divisors is an integer number (154729329972).

Almost surely, 2^{1620973932820} is an apocalyptic number.

1620973932820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620973932820 is an abundant number, since it is smaller than the sum of its proper divisors (2092529986508).

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

1620973932820 is a wasteful number, since it uses less digits than its factorization.

1620973932820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7368063351 (or 7368063349 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 1620973932820 in words is "one trillion, six hundred twenty billion, nine hundred seventy-three million, nine hundred thirty-two thousand, eight hundred twenty".