20133749 has 4 divisors (see below), whose sum is σ = 21193440. Its totient is φ = 19074060.

The previous prime is 20133739. The next prime is 20133769. The reversal of 20133749 is 94733102.

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 not a de Polignac number, because 20133749 - 2¹² = 20129653 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 (20133739) 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, 529817 + ... + 529854.

It is an arithmetic number, because the mean of its divisors is an integer number (5298360).

Almost surely, 2^20133749 is an apocalyptic number.

It is an amenable number.

20133749 is a deficient number, since it is larger than the sum of its proper divisors (1059691).

20133749 is a wasteful number, since it uses less digits than its factorization.

20133749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059690.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20133749 is about 4487.0646306912. The cubic root of 20133749 is about 272.0455022276.

The spelling of 20133749 in words is "twenty million, one hundred thirty-three thousand, seven hundred forty-nine".