16920769 has 4 divisors (see below), whose sum is σ = 17110980. Its totient is φ = 16730560.

The previous prime is 16920751. The next prime is 16920793. The reversal of 16920769 is 96702961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96702961 = 3343 ⋅28927.

It can be written as a sum of positive squares in 2 ways, for example, as 11992369 + 4928400 = 3463^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 16920769 - 2⁷ = 16920641 is a prime.

It is a super-2 number, since 2×16920769² = 572624847102722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16920749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94972 + ... + 95149.

It is an arithmetic number, because the mean of its divisors is an integer number (4277745).

Almost surely, 2^16920769 is an apocalyptic number.

It is an amenable number.

16920769 is a deficient number, since it is larger than the sum of its proper divisors (190211).

16920769 is an equidigital number, since it uses as much as digits as its factorization.

16920769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190210.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 16920769 is about 4113.4862343273. The cubic root of 16920769 is about 256.7280756720.

It can be divided in two parts, 16920 and 769, that added together give a square (17689 = 133²).

The spelling of 16920769 in words is "sixteen million, nine hundred twenty thousand, seven hundred sixty-nine".