1720920 has 32 divisors (see below), whose sum is σ = 5163120. Its totient is φ = 458880.

The previous prime is 1720909. The next prime is 1720931. The reversal of 1720920 is 290271.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1720909) and next prime (1720931).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7051 + ... + 7290.

2^1720920 is an apocalyptic number.

1720920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720920 is an abundant number, since it is smaller than the sum of its proper divisors (3442200).

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

1720920 is a wasteful number, since it uses less digits than its factorization.

1720920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14355 (or 14351 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 1720920 is about 1311.8384046825. The cubic root of 1720920 is about 119.8358867705.

The spelling of 1720920 in words is "one million, seven hundred twenty thousand, nine hundred twenty".