191663020 has 24 divisors (see below), whose sum is σ = 403878384. Its totient is φ = 76401216.

The previous prime is 191663011. The next prime is 191663027. The reversal of 191663020 is 20366191.

It is a self number, because there is not a number n which added to its sum of digits gives 191663020.

It is not an unprimeable number, because it can be changed into a prime (191663027) 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, 10494 + ... + 22213.

It is an arithmetic number, because the mean of its divisors is an integer number (16828266).

Almost surely, 2^191663020 is an apocalyptic number.

191663020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191663020 is an abundant number, since it is smaller than the sum of its proper divisors (212215364).

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

191663020 is a wasteful number, since it uses less digits than its factorization.

191663020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33009 (or 33007 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 191663020 is about 13844.2414021137. The cubic root of 191663020 is about 576.5621240465.

The spelling of 191663020 in words is "one hundred ninety-one million, six hundred sixty-three thousand, twenty".