1020206664 has 40 divisors (see below), whose sum is σ = 2857525110. Its totient is φ = 340068672.

The previous prime is 1020206641. The next prime is 1020206717. The reversal of 1020206664 is 4666020201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 577440900 + 442765764 = 24030^2 + 21042^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 786549 + ... + 787844.

Almost surely, 2^1020206664 is an apocalyptic number.

It is an amenable number.

1020206664 is an abundant number, since it is smaller than the sum of its proper divisors (1837318446).

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

1020206664 is a wasteful number, since it uses less digits than its factorization.

1020206664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574411 (or 1574398 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1020206664 is about 31940.6741318965. The cubic root of 1020206664 is about 1006.6906895037.

Adding to 1020206664 its reverse (4666020201), we get a palindrome (5686226865).

The spelling of 1020206664 in words is "one billion, twenty million, two hundred six thousand, six hundred sixty-four".