20673256729 has 8 divisors (see below), whose sum is σ = 20737347840. Its totient is φ = 20609265216.

The previous prime is 20673256699. The next prime is 20673256741. The reversal of 20673256729 is 92765237602.

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 20673256729 - 2⁷ = 20673256601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20673259729) 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, 402124 + ... + 450610.

It is an arithmetic number, because the mean of its divisors is an integer number (2592168480).

Almost surely, 2^20673256729 is an apocalyptic number.

It is an amenable number.

20673256729 is a deficient number, since it is larger than the sum of its proper divisors (64091111).

20673256729 is an equidigital number, since it uses as much as digits as its factorization.

20673256729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49799.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 20673256729 in words is "twenty billion, six hundred seventy-three million, two hundred fifty-six thousand, seven hundred twenty-nine".