20263025093809 has 9 divisors (see below), whose sum is σ = 21525163311211. Its totient is φ = 19071010418080.

The previous prime is 20263025093789. The next prime is 20263025093921. The reversal of 20263025093809 is 90839052036202.

The square root of 20263025093809 is 4501447.

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., 15775711578225 + 4487313515584 = 3971865^2 + 2118328^2 .

It is not a de Polignac number, because 20263025093809 - 2¹⁷ = 20263024962737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20263025093609) 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, 76392204 + ... + 76656994.

Almost surely, 2^{20263025093809} is an apocalyptic number.

20263025093809 is the 4501447-th square number.

20263025093809 is the 2250724-th centered octagonal number.

It is an amenable number.

20263025093809 is a deficient number, since it is larger than the sum of its proper divisors (1262138217402).

20263025093809 is an frugal number, since it uses more digits than its factorization.

20263025093809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529616 (or 264808 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 49.

Multiplying 20263025093809 by its sum of digits (49), we get a square (992888229596641 = 31510129²).

The spelling of 20263025093809 in words is "twenty trillion, two hundred sixty-three billion, twenty-five million, ninety-three thousand, eight hundred nine".