20273729 has 4 divisors (see below), whose sum is σ = 23169984. Its totient is φ = 17377476.

The previous prime is 20273717. The next prime is 20273761. The reversal of 20273729 is 92737202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20273729 - 2¹² = 20269633 is a prime.

It is a super-2 number, since 2×20273729² = 822048175130882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20273695 and 20273704.

It is not an unprimeable number, because it can be changed into a prime (20278729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1448117 + ... + 1448130.

It is an arithmetic number, because the mean of its divisors is an integer number (5792496).

Almost surely, 2^20273729 is an apocalyptic number.

It is an amenable number.

20273729 is a deficient number, since it is larger than the sum of its proper divisors (2896255).

20273729 is an equidigital number, since it uses as much as digits as its factorization.

20273729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896254.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20273729 is about 4502.6357836272. The cubic root of 20273729 is about 272.6745126863.

The spelling of 20273729 in words is "twenty million, two hundred seventy-three thousand, seven hundred twenty-nine".