920820660 has 48 divisors (see below), whose sum is σ = 2589402816. Its totient is φ = 244494592.

The previous prime is 920820653. The next prime is 920820661. The reversal of 920820660 is 66028029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920820661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18954 + ... + 46913.

It is an arithmetic number, because the mean of its divisors is an integer number (53945892).

Almost surely, 2^920820660 is an apocalyptic number.

It is an amenable number.

920820660 is an abundant number, since it is smaller than the sum of its proper divisors (1668582156).

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

920820660 is a wasteful number, since it uses less digits than its factorization.

920820660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66112 (or 66110 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 920820660 is about 30345.0269401759. The cubic root of 920820660 is about 972.8779303989.

Adding to 920820660 its reverse (66028029), we get a palindrome (986848689).

The spelling of 920820660 in words is "nine hundred twenty million, eight hundred twenty thousand, six hundred sixty".