1720420497 has 12 divisors (see below), whose sum is σ = 2542844304. Its totient is φ = 1120273560.

The previous prime is 1720420489. The next prime is 1720420543. The reversal of 1720420497 is 7940240271.

It is not a de Polignac number, because 1720420497 - 2³ = 1720420489 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1720420397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2222379 + ... + 2223152.

It is an arithmetic number, because the mean of its divisors is an integer number (211903692).

Almost surely, 2^1720420497 is an apocalyptic number.

It is an amenable number.

1720420497 is a deficient number, since it is larger than the sum of its proper divisors (822423807).

1720420497 is a wasteful number, since it uses less digits than its factorization.

1720420497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4445580 (or 4445577 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 1720420497 is about 41477.9519383491. The cubic root of 1720420497 is about 1198.2429138794.

The spelling of 1720420497 in words is "one billion, seven hundred twenty million, four hundred twenty thousand, four hundred ninety-seven".