20748217 has 12 divisors (see below), whose sum is σ = 24375936. Its totient is φ = 17607240.

The previous prime is 20748199. The next prime is 20748223. The reversal of 20748217 is 71284702.

It is a de Polignac number, because none of the positive numbers 2^k-20748217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20748017) 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, 2992 + ... + 7102.

It is an arithmetic number, because the mean of its divisors is an integer number (2031328).

Almost surely, 2^20748217 is an apocalyptic number.

It is an amenable number.

20748217 is a deficient number, since it is larger than the sum of its proper divisors (3627719).

20748217 is a wasteful number, since it uses less digits than its factorization.

20748217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228 (or 4221 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 20748217 is about 4555.0210756922. The cubic root of 20748217 is about 274.7853619948.

The spelling of 20748217 in words is "twenty million, seven hundred forty-eight thousand, two hundred seventeen".