20650749 has 16 divisors (see below), whose sum is σ = 31559808. Its totient is φ = 11765952.

The previous prime is 20650691. The next prime is 20650753. The reversal of 20650749 is 94705602.

It is not a de Polignac number, because 20650749 - 2⁹ = 20650237 is a prime.

It is a super-3 number, since 3×20650749³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7099 + ... + 9575.

It is an arithmetic number, because the mean of its divisors is an integer number (1972488).

Almost surely, 2^20650749 is an apocalyptic number.

It is an amenable number.

20650749 is a deficient number, since it is larger than the sum of its proper divisors (10909059).

20650749 is a wasteful number, since it uses less digits than its factorization.

20650749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20650749 is about 4544.3095185077. The cubic root of 20650749 is about 274.3544040282.

The spelling of 20650749 in words is "twenty million, six hundred fifty thousand, seven hundred forty-nine".