20729323 has 4 divisors (see below), whose sum is σ = 21820360. Its totient is φ = 19638288.

The previous prime is 20729281. The next prime is 20729329. The reversal of 20729323 is 32392702.

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

It is a cyclic number.

It is not a de Polignac number, because 20729323 - 2⁹ = 20728811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20729291 and 20729300.

It is not an unprimeable number, because it can be changed into a prime (20729329) 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, 545490 + ... + 545527.

It is an arithmetic number, because the mean of its divisors is an integer number (5455090).

Almost surely, 2^20729323 is an apocalyptic number.

20729323 is a deficient number, since it is larger than the sum of its proper divisors (1091037).

20729323 is a wasteful number, since it uses less digits than its factorization.

20729323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091036.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20729323 is about 4552.9466282837. The cubic root of 20729323 is about 274.7019271730.

The spelling of 20729323 in words is "twenty million, seven hundred twenty-nine thousand, three hundred twenty-three".