20796749 has 4 divisors (see below), whose sum is σ = 20818140. Its totient is φ = 20775360.

The previous prime is 20796739. The next prime is 20796779. The reversal of 20796749 is 94769702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13468900 + 7327849 = 3670^2 + 2707^2 .

It is a cyclic number.

It is not a de Polignac number, because 20796749 - 2⁸ = 20796493 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 (20796739) 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, 9164 + ... + 11205.

It is an arithmetic number, because the mean of its divisors is an integer number (5204535).

Almost surely, 2^20796749 is an apocalyptic number.

It is an amenable number.

20796749 is a deficient number, since it is larger than the sum of its proper divisors (21391).

20796749 is a wasteful number, since it uses less digits than its factorization.

20796749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21390.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 20796749 is about 4560.3452720161. The cubic root of 20796749 is about 274.9994446270. Note that the first 3 decimals are identical.

The spelling of 20796749 in words is "twenty million, seven hundred ninety-six thousand, seven hundred forty-nine".