20277009 has 27 divisors (see below), whose sum is σ = 31307913. Its totient is φ = 12644424.

The previous prime is 20276989. The next prime is 20277011. The reversal of 20277009 is 90077202.

The square root of 20277009 is 4503.

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

It is not a de Polignac number, because 20277009 - 2⁹ = 20276497 is a prime.

It is a super-2 number, since 2×20277009² = 822314187972162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20277029) 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, 256632 + ... + 256710.

Almost surely, 2^20277009 is an apocalyptic number.

20277009 is the 4503-rd square number.

20277009 is the 2252-nd centered octagonal number.

It is an amenable number.

20277009 is a deficient number, since it is larger than the sum of its proper divisors (11030904).

20277009 is an equidigital number, since it uses as much as digits as its factorization.

20277009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The cubic root of 20277009 is about 272.6892168415.

Multiplying 20277009 by its product of nonzero digits (1764), we get a square (35768643876 = 189126²).

The spelling of 20277009 in words is "twenty million, two hundred seventy-seven thousand, nine".