6420433620 has 24 divisors (see below), whose sum is σ = 17977214304. Its totient is φ = 1712115616.

The previous prime is 6420433619. The next prime is 6420433651. The reversal of 6420433620 is 263340246.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53503554 + ... + 53503673.

It is an arithmetic number, because the mean of its divisors is an integer number (749050596).

Almost surely, 2^6420433620 is an apocalyptic number.

6420433620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6420433620 is an abundant number, since it is smaller than the sum of its proper divisors (11556780684).

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

6420433620 is a wasteful number, since it uses less digits than its factorization.

6420433620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107007239 (or 107007237 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 6420433620 is about 80127.6083506802. The cubic root of 6420433620 is about 1858.6093605860.

Adding to 6420433620 its reverse (263340246), we get a palindrome (6683773866).

The spelling of 6420433620 in words is "six billion, four hundred twenty million, four hundred thirty-three thousand, six hundred twenty".