991929020 has 48 divisors (see below), whose sum is σ = 2105157600. Its totient is φ = 392582400.

The previous prime is 991929013. The next prime is 991929047. The reversal of 991929020 is 20929199.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1414670 + ... + 1415370.

It is an arithmetic number, because the mean of its divisors is an integer number (43857450).

Almost surely, 2^991929020 is an apocalyptic number.

It is an amenable number.

991929020 is an abundant number, since it is smaller than the sum of its proper divisors (1113228580).

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

991929020 is a wasteful number, since it uses less digits than its factorization.

991929020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 991929020 is about 31494.9046672632. The cubic root of 991929020 is about 997.3024028464.

The spelling of 991929020 in words is "nine hundred ninety-one million, nine hundred twenty-nine thousand, twenty".