20996530 has 32 divisors (see below), whose sum is σ = 40407984. Its totient is φ = 7827456.

The previous prime is 20996497. The next prime is 20996531. The reversal of 20996530 is 3569902.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 12229009 + 8767521 = 3497^2 + 2961^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (20996531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18664 + ... + 19756.

Almost surely, 2^20996530 is an apocalyptic number.

20996530 is a deficient number, since it is larger than the sum of its proper divisors (19411454).

20996530 is a wasteful number, since it uses less digits than its factorization.

20996530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 20996530 is about 4582.1970712749. The cubic root of 20996530 is about 275.8772208219.

The spelling of 20996530 in words is "twenty million, nine hundred ninety-six thousand, five hundred thirty".