20750643 has 6 divisors (see below), whose sum is σ = 29973164. Its totient is φ = 13833756.

The previous prime is 20750627. The next prime is 20750647. The reversal of 20750643 is 34605702.

It is a happy number.

It is not a de Polignac number, because 20750643 - 2⁴ = 20750627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20750647) 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, 1152805 + ... + 1152822.

Almost surely, 2^20750643 is an apocalyptic number.

20750643 is a deficient number, since it is larger than the sum of its proper divisors (9222521).

20750643 is a wasteful number, since it uses less digits than its factorization.

20750643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305633 (or 2305630 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20750643 is about 4555.2873674446. The cubic root of 20750643 is about 274.7960714019.

The spelling of 20750643 in words is "twenty million, seven hundred fifty thousand, six hundred forty-three".