20913733 has 4 divisors (see below), whose sum is σ = 20930400. Its totient is φ = 20897068.

The previous prime is 20913719. The next prime is 20913773. The reversal of 20913733 is 33731902.

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-20913733 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 (20913773) 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, 6283 + ... + 9016.

It is an arithmetic number, because the mean of its divisors is an integer number (5232600).

Almost surely, 2^20913733 is an apocalyptic number.

It is an amenable number.

20913733 is a deficient number, since it is larger than the sum of its proper divisors (16667).

20913733 is a wasteful number, since it uses less digits than its factorization.

20913733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16666.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 20913733 is about 4573.1535071546. The cubic root of 20913733 is about 275.5141148430.

The spelling of 20913733 in words is "twenty million, nine hundred thirteen thousand, seven hundred thirty-three".