20462444209 has 9 divisors (see below), whose sum is σ = 20863542763. Its totient is φ = 20068921912.

The previous prime is 20462444207. The next prime is 20462444227. The reversal of 20462444209 is 90244426402.

It is a happy number.

The square root of 20462444209 is 143047.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14751317025 + 5711127184 = 121455^2 + 75572^2 .

It is not a de Polignac number, because 20462444209 - 2¹ = 20462444207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20462444207) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7580142 + ... + 7582840.

Almost surely, 2^20462444209 is an apocalyptic number.

20462444209 is the 143047-th square number.

20462444209 is the 71524-th centered octagonal number.

It is an amenable number.

20462444209 is a deficient number, since it is larger than the sum of its proper divisors (401098554).

20462444209 is an frugal number, since it uses more digits than its factorization.

20462444209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5504 (or 2752 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

The spelling of 20462444209 in words is "twenty billion, four hundred sixty-two million, four hundred forty-four thousand, two hundred nine".