4020720465 has 16 divisors (see below), whose sum is σ = 6440932800. Its totient is φ = 2141790912.

The previous prime is 4020720427. The next prime is 4020720467. The reversal of 4020720465 is 5640270204.

It is not a de Polignac number, because 4020720465 - 2¹⁴ = 4020704081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4020720467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149235 + ... + 174104.

It is an arithmetic number, because the mean of its divisors is an integer number (402558300).

Almost surely, 2^4020720465 is an apocalyptic number.

It is an amenable number.

4020720465 is a deficient number, since it is larger than the sum of its proper divisors (2420212335).

4020720465 is a wasteful number, since it uses less digits than its factorization.

4020720465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324176.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 4020720465 is about 63409.1512717210. The cubic root of 4020720465 is about 1590.1373066820.

Adding to 4020720465 its reverse (5640270204), we get a palindrome (9660990669).

The spelling of 4020720465 in words is "four billion, twenty million, seven hundred twenty thousand, four hundred sixty-five".