20749149 has 16 divisors (see below), whose sum is σ = 30824640. Its totient is φ = 13794480.

The previous prime is 20749147. The next prime is 20749187. The reversal of 20749149 is 94194702.

It is not a de Polignac number, because 20749149 - 2¹ = 20749147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20749147) 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, 11614 + ... + 13280.

It is an arithmetic number, because the mean of its divisors is an integer number (1926540).

Almost surely, 2^20749149 is an apocalyptic number.

It is an amenable number.

20749149 is a deficient number, since it is larger than the sum of its proper divisors (10075491).

20749149 is a wasteful number, since it uses less digits than its factorization.

20749149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137 (or 2131 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 20749149 is about 4555.1233792292. The cubic root of 20749149 is about 274.7894763423.

The spelling of 20749149 in words is "twenty million, seven hundred forty-nine thousand, one hundred forty-nine".