1722020 has 24 divisors (see below), whose sum is σ = 3742200. Its totient is φ = 664832.

The previous prime is 1722013. The next prime is 1722029. The reversal of 1722020 is 202271.

It can be written as a sum of positive squares in 4 ways, for example, as 676 + 1721344 = 26^2 + 1312^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1721986 and 1722004.

It is not an unprimeable number, because it can be changed into a prime (1722029) 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, 905 + ... + 2064.

It is an arithmetic number, because the mean of its divisors is an integer number (155925).

2^1722020 is an apocalyptic number.

1722020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1722020 is an abundant number, since it is smaller than the sum of its proper divisors (2020180).

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

1722020 is a wasteful number, since it uses less digits than its factorization.

1722020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007 (or 3005 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 1722020 is about 1312.2575966631. The cubic root of 1722020 is about 119.8614140852.

Adding to 1722020 its reverse (202271), we get a palindrome (1924291).

The spelling of 1722020 in words is "one million, seven hundred twenty-two thousand, twenty".