1720501420 has 36 divisors (see below), whose sum is σ = 3971377872. Its totient is φ = 625636000.

The previous prime is 1720501417. The next prime is 1720501429. The reversal of 1720501420 is 241050271.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1720501391 and 1720501400.

It is not an unprimeable number, because it can be changed into a prime (1720501429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353056 + ... + 357895.

It is an arithmetic number, because the mean of its divisors is an integer number (110316052).

Almost surely, 2^1720501420 is an apocalyptic number.

1720501420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720501420 is an abundant number, since it is smaller than the sum of its proper divisors (2250876452).

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

1720501420 is a wasteful number, since it uses less digits than its factorization.

1720501420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710982 (or 710969 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 1720501420 is about 41478.9274210412. The cubic root of 1720501420 is about 1198.2617007382.

Adding to 1720501420 its reverse (241050271), we get a palindrome (1961551691).

The spelling of 1720501420 in words is "one billion, seven hundred twenty million, five hundred one thousand, four hundred twenty".