20719733 has 4 divisors (see below), whose sum is σ = 20732640. Its totient is φ = 20706828.

The previous prime is 20719729. The next prime is 20719739. The reversal of 20719733 is 33791702.

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 20719733 - 2² = 20719729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20719733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20719739) 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, 3635 + ... + 7392.

It is an arithmetic number, because the mean of its divisors is an integer number (5183160).

Almost surely, 2^20719733 is an apocalyptic number.

It is an amenable number.

20719733 is a deficient number, since it is larger than the sum of its proper divisors (12907).

20719733 is a wasteful number, since it uses less digits than its factorization.

20719733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12906.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 20719733 is about 4551.8933423357. The cubic root of 20719733 is about 274.6595588841.

The spelling of 20719733 in words is "twenty million, seven hundred nineteen thousand, seven hundred thirty-three".