1020665842 has 16 divisors (see below), whose sum is σ = 1752581952. Its totient is φ = 436710960.

The previous prime is 1020665791. The next prime is 1020665843. The reversal of 1020665842 is 2485660201.

It is a super-2 number, since 2×1020665842² = 2083517522051137928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1020665798 and 1020665807.

It is not an unprimeable number, because it can be changed into a prime (1020665843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50884 + ... + 68047.

It is an arithmetic number, because the mean of its divisors is an integer number (109536372).

Almost surely, 2^1020665842 is an apocalyptic number.

1020665842 is a deficient number, since it is larger than the sum of its proper divisors (731916110).

1020665842 is a wasteful number, since it uses less digits than its factorization.

1020665842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119553.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 1020665842 is about 31947.8613055710. The cubic root of 1020665842 is about 1006.8416984122.

The spelling of 1020665842 in words is "one billion, twenty million, six hundred sixty-five thousand, eight hundred forty-two".