920720772 has 36 divisors (see below), whose sum is σ = 2449872880. Its totient is φ = 290753712.

The previous prime is 920720771. The next prime is 920720777. The reversal of 920720772 is 277027029.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (920720771) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 672358 + ... + 673725.

Almost surely, 2^920720772 is an apocalyptic number.

It is an amenable number.

920720772 is an abundant number, since it is smaller than the sum of its proper divisors (1529152108).

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

920720772 is a wasteful number, since it uses less digits than its factorization.

920720772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346112 (or 1346107 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 920720772 is about 30343.3810245332. The cubic root of 920720772 is about 972.8427507854.

The spelling of 920720772 in words is "nine hundred twenty million, seven hundred twenty thousand, seven hundred seventy-two".