1720920930 has 16 divisors (see below), whose sum is σ = 4130210304. Its totient is φ = 458912240.

The previous prime is 1720920913. The next prime is 1720920937. The reversal of 1720920930 is 390290271.

It is a junction number, because it is equal to n+sod(n) for n = 1720920891 and 1720920900.

It is not an unprimeable number, because it can be changed into a prime (1720920937) 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, 28681986 + ... + 28682045.

It is an arithmetic number, because the mean of its divisors is an integer number (258138144).

Almost surely, 2^1720920930 is an apocalyptic number.

1720920930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1720920930 is an abundant number, since it is smaller than the sum of its proper divisors (2409289374).

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

1720920930 is a wasteful number, since it uses less digits than its factorization.

1720920930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57364041.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 1720920930 is about 41483.9840179315. The cubic root of 1720920930 is about 1198.3590835727.

The spelling of 1720920930 in words is "one billion, seven hundred twenty million, nine hundred twenty thousand, nine hundred thirty".