20736749 has 4 divisors (see below), whose sum is σ = 22621920. Its totient is φ = 18851580.

The previous prime is 20736739. The next prime is 20736763. The reversal of 20736749 is 94763702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20736749 - 2¹⁶ = 20671213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942569 + ... + 942590.

It is an arithmetic number, because the mean of its divisors is an integer number (5655480).

Almost surely, 2^20736749 is an apocalyptic number.

It is an amenable number.

20736749 is a deficient number, since it is larger than the sum of its proper divisors (1885171).

20736749 is a wasteful number, since it uses less digits than its factorization.

20736749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885170.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 20736749 is about 4553.7620710793. The cubic root of 20736749 is about 274.7347260085.

The spelling of 20736749 in words is "twenty million, seven hundred thirty-six thousand, seven hundred forty-nine".