64020420 has 36 divisors (see below), whose sum is σ = 194195820. Its totient is φ = 17072064.

The previous prime is 64020413. The next prime is 64020427. The reversal of 64020420 is 2402046.

64020420 is a `hidden beast` number, since 640 + 2 + 0 + 4 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (64020413) and next prime (64020427).

It can be written as a sum of positive squares in 2 ways, for example, as 43007364 + 21013056 = 6558^2 + 4584^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×64020420² = 8197228353952800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 64020393 and 64020402.

It is not an unprimeable number, because it can be changed into a prime (64020427) 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, 177655 + ... + 178014.

Almost surely, 2^64020420 is an apocalyptic number.

64020420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64020420 is an abundant number, since it is smaller than the sum of its proper divisors (130175400).

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

64020420 is a wasteful number, since it uses less digits than its factorization.

64020420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355684 (or 355679 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 64020420 is about 8001.2761482154. The cubic root of 64020420 is about 400.0425371430.

Adding to 64020420 its reverse (2402046), we get a palindrome (66422466).

The spelling of 64020420 in words is "sixty-four million, twenty thousand, four hundred twenty".