1020656993 has 8 divisors (see below), whose sum is σ = 1091010816. Its totient is φ = 952468000.

The previous prime is 1020656983. The next prime is 1020657017. The reversal of 1020656993 is 3996560201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020656993 - 2⁶ = 1020656929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1020656993.

It is not an unprimeable number, because it can be changed into a prime (1020656983) 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, 540233 + ... + 542118.

It is an arithmetic number, because the mean of its divisors is an integer number (136376352).

Almost surely, 2^1020656993 is an apocalyptic number.

It is an amenable number.

1020656993 is a deficient number, since it is larger than the sum of its proper divisors (70353823).

1020656993 is a wasteful number, since it uses less digits than its factorization.

1020656993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082415.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 1020656993 is about 31947.7228139972. The cubic root of 1020656993 is about 1006.8387886881.

The spelling of 1020656993 in words is "one billion, twenty million, six hundred fifty-six thousand, nine hundred ninety-three".