20637243 has 12 divisors (see below), whose sum is σ = 32519448. Its totient is φ = 12507360.

The previous prime is 20637223. The next prime is 20637247. The reversal of 20637243 is 34273602.

20637243 is a `hidden beast` number, since 2 + 0 + 637 + 24 + 3 = 666.

It is not a de Polignac number, because 20637243 - 2¹² = 20633147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20637247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104130 + ... + 104327.

It is an arithmetic number, because the mean of its divisors is an integer number (2709954).

Almost surely, 2^20637243 is an apocalyptic number.

20637243 is a deficient number, since it is larger than the sum of its proper divisors (11882205).

20637243 is a wasteful number, since it uses less digits than its factorization.

20637243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208474 (or 208471 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 27.

The square root of 20637243 is about 4542.8232411134. The cubic root of 20637243 is about 274.2945799078.

The spelling of 20637243 in words is "twenty million, six hundred thirty-seven thousand, two hundred forty-three".