20745650 has 12 divisors (see below), whose sum is σ = 38587002. Its totient is φ = 8298240.

The previous prime is 20745649. The next prime is 20745667. The reversal of 20745650 is 5654702.

It can be written as a sum of positive squares in 3 ways, for example, as 14845609 + 5900041 = 3853^2 + 2429^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207407 + ... + 207506.

Almost surely, 2^20745650 is an apocalyptic number.

20745650 is a deficient number, since it is larger than the sum of its proper divisors (17841352).

20745650 is a wasteful number, since it uses less digits than its factorization.

20745650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414925 (or 414920 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 20745650 is about 4554.7392900143. The cubic root of 20745650 is about 274.7740292440.

The spelling of 20745650 in words is "twenty million, seven hundred forty-five thousand, six hundred fifty".