9920661 has 8 divisors (see below), whose sum is σ = 13242240. Its totient is φ = 6606432.

The previous prime is 9920657. The next prime is 9920671. The reversal of 9920661 is 1660299.

It is a happy number.

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

It is not a de Polignac number, because 9920661 - 2² = 9920657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9920611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3705 + ... + 5793.

It is an arithmetic number, because the mean of its divisors is an integer number (1655280).

Almost surely, 2^9920661 is an apocalyptic number.

It is an amenable number.

9920661 is a deficient number, since it is larger than the sum of its proper divisors (3321579).

9920661 is a wasteful number, since it uses less digits than its factorization.

9920661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 9920661 is about 3149.7080817117. The cubic root of 9920661 is about 214.8721865166.

The spelling of 9920661 in words is "nine million, nine hundred twenty thousand, six hundred sixty-one".