20412749 has 4 divisors (see below), whose sum is σ = 23328864. Its totient is φ = 17496636.

The previous prime is 20412727. The next prime is 20412797. The reversal of 20412749 is 94721402.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20412749 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 (20412709) 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, 1458047 + ... + 1458060.

It is an arithmetic number, because the mean of its divisors is an integer number (5832216).

Almost surely, 2^20412749 is an apocalyptic number.

It is an amenable number.

20412749 is a deficient number, since it is larger than the sum of its proper divisors (2916115).

20412749 is an equidigital number, since it uses as much as digits as its factorization.

20412749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2916114.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20412749 is about 4518.0470338411. The cubic root of 20412749 is about 273.2963501750.

The spelling of 20412749 in words is "twenty million, four hundred twelve thousand, seven hundred forty-nine".