20726669 has 8 divisors (see below), whose sum is σ = 21089208. Its totient is φ = 20367360.

The previous prime is 20726653. The next prime is 20726681. The reversal of 20726669 is 96662702.

It can be written as a sum of positive squares in 4 ways, for example, as 133225 + 20593444 = 365^2 + 4538^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20726669 - 2⁴ = 20726653 is a prime.

It is a super-2 number, since 2×20726669² = 859189615671122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20726609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14549 + ... + 15909.

It is an arithmetic number, because the mean of its divisors is an integer number (2636151).

Almost surely, 2^20726669 is an apocalyptic number.

It is an amenable number.

20726669 is a deficient number, since it is larger than the sum of its proper divisors (362539).

20726669 is a wasteful number, since it uses less digits than its factorization.

20726669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20726669 is about 4552.6551593548. The cubic root of 20726669 is about 274.6902032006.

The spelling of 20726669 in words is "twenty million, seven hundred twenty-six thousand, six hundred sixty-nine".