20869245 has 30 divisors (see below), whose sum is σ = 37575582. Its totient is φ = 11081232.

The previous prime is 20869237. The next prime is 20869273. The reversal of 20869245 is 54296802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 4173849 = 4086^2 + 2043^2 .

It is not a de Polignac number, because 20869245 - 2³ = 20869237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 91822 + ... + 92048.

Almost surely, 2^20869245 is an apocalyptic number.

It is an amenable number.

20869245 is a deficient number, since it is larger than the sum of its proper divisors (16706337).

20869245 is an frugal number, since it uses more digits than its factorization.

20869245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 20869245 is about 4568.2868780321. The cubic root of 20869245 is about 275.3186169315.

The spelling of 20869245 in words is "twenty million, eight hundred sixty-nine thousand, two hundred forty-five".