1720426211 has 12 divisors (see below), whose sum is σ = 2043895968. Its totient is φ = 1443273552.

The previous prime is 1720426207. The next prime is 1720426217. The reversal of 1720426211 is 1126240271.

It is not a de Polignac number, because 1720426211 - 2² = 1720426207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720426217) 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, 371216 + ... + 375821.

It is an arithmetic number, because the mean of its divisors is an integer number (170324664).

Almost surely, 2^1720426211 is an apocalyptic number.

1720426211 is a deficient number, since it is larger than the sum of its proper divisors (323469757).

1720426211 is an equidigital number, since it uses as much as digits as its factorization.

1720426211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747098 (or 747091 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1720426211 is about 41478.0208182599. The cubic root of 1720426211 is about 1198.2442404451.

Adding to 1720426211 its reverse (1126240271), we get a palindrome (2846666482).

The spelling of 1720426211 in words is "one billion, seven hundred twenty million, four hundred twenty-six thousand, two hundred eleven".