991206020 has 24 divisors (see below), whose sum is σ = 2378894784. Its totient is φ = 339842016.

The previous prime is 991206017. The next prime is 991206031. The reversal of 991206020 is 20602199.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3539882 + ... + 3540161.

It is an arithmetic number, because the mean of its divisors is an integer number (99120616).

Almost surely, 2^991206020 is an apocalyptic number.

It is an amenable number.

991206020 is an abundant number, since it is smaller than the sum of its proper divisors (1387688764).

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

991206020 is a wasteful number, since it uses less digits than its factorization.

991206020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7080059 (or 7080057 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 991206020 is about 31483.4245278369. The cubic root of 991206020 is about 997.0600384297.

The spelling of 991206020 in words is "nine hundred ninety-one million, two hundred six thousand, twenty".