20262668409 has 27 divisors (see below), whose sum is σ = 30610999237. Its totient is φ = 12914858616.

The previous prime is 20262668383. The next prime is 20262668411. The reversal of 20262668409 is 90486626202.

The square root of 20262668409 is 142347.

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

It is not a de Polignac number, because 20262668409 - 2¹³ = 20262660217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20262668479) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9820912 + ... + 9822974.

Almost surely, 2^20262668409 is an apocalyptic number.

20262668409 is the 142347-th square number.

20262668409 is the 71174-th centered octagonal number.

It is an amenable number.

20262668409 is a deficient number, since it is larger than the sum of its proper divisors (10348330828).

20262668409 is an frugal number, since it uses more digits than its factorization.

20262668409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178 (or 2089 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 20262668409 in words is "twenty billion, two hundred sixty-two million, six hundred sixty-eight thousand, four hundred nine".