20712249 has 6 divisors (see below), whose sum is σ = 29917706. Its totient is φ = 13808160.

The previous prime is 20712227. The next prime is 20712253. The reversal of 20712249 is 94221702.

It can be written as a sum of positive squares in only one way, i.e., 18766224 + 1946025 = 4332^2 + 1395^2 .

It is not a de Polignac number, because 20712249 - 2¹⁹ = 20187961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20712449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1150672 + ... + 1150689.

Almost surely, 2^20712249 is an apocalyptic number.

It is an amenable number.

20712249 is a deficient number, since it is larger than the sum of its proper divisors (9205457).

20712249 is a wasteful number, since it uses less digits than its factorization.

20712249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301367 (or 2301364 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20712249 is about 4551.0711925875. The cubic root of 20712249 is about 274.6264857475.

The spelling of 20712249 in words is "twenty million, seven hundred twelve thousand, two hundred forty-nine".