9920643 has 8 divisors (see below), whose sum is σ = 13246800. Its totient is φ = 6604128.

The previous prime is 9920621. The next prime is 9920653. The reversal of 9920643 is 3460299.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9920643 - 2⁵ = 9920611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9920653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493 + ... + 4481.

It is an arithmetic number, because the mean of its divisors is an integer number (1655850).

Almost surely, 2^9920643 is an apocalyptic number.

9920643 is a deficient number, since it is larger than the sum of its proper divisors (3326157).

9920643 is a wasteful number, since it uses less digits than its factorization.

9920643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4821.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 9920643 is about 3149.7052243027. The cubic root of 9920643 is about 214.8720565621.

The spelling of 9920643 in words is "nine million, nine hundred twenty thousand, six hundred forty-three".