1020640003 has 8 divisors (see below), whose sum is σ = 1026249728. Its totient is φ = 1015039944.

The previous prime is 1020639989. The next prime is 1020640013. The reversal of 1020640003 is 3000460201.

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 1020640003 - 2¹³ = 1020631811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020640013) 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 7 ways as a sum of consecutive naturals, for example, 321100 + ... + 324262.

It is an arithmetic number, because the mean of its divisors is an integer number (128281216).

Almost surely, 2^1020640003 is an apocalyptic number.

1020640003 is a deficient number, since it is larger than the sum of its proper divisors (5609725).

1020640003 is a wasteful number, since it uses less digits than its factorization.

1020640003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4833.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1020640003 is about 31947.4569097448. The cubic root of 1020640003 is about 1006.8332019970.

The spelling of 1020640003 in words is "one billion, twenty million, six hundred forty thousand, three".