20729366 has 8 divisors (see below), whose sum is σ = 35536080. Its totient is φ = 8884008.

The previous prime is 20729351. The next prime is 20729369. The reversal of 20729366 is 66392702.

It is a happy number.

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

It is a super-2 number, since 2×20729366² = 859413229523912, which contains 22 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20729369) 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, 740321 + ... + 740348.

It is an arithmetic number, because the mean of its divisors is an integer number (4442010).

Almost surely, 2^20729366 is an apocalyptic number.

20729366 is a deficient number, since it is larger than the sum of its proper divisors (14806714).

20729366 is a wasteful number, since it uses less digits than its factorization.

20729366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480678.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 20729366 is about 4552.9513504978. The cubic root of 20729366 is about 274.7021171161.

The spelling of 20729366 in words is "twenty million, seven hundred twenty-nine thousand, three hundred sixty-six".