20723679 has 6 divisors (see below), whose sum is σ = 29934216. Its totient is φ = 13815780.

The previous prime is 20723671. The next prime is 20723683. The reversal of 20723679 is 97632702.

It is not a de Polignac number, because 20723679 - 2³ = 20723671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1151307 + ... + 1151324.

It is an arithmetic number, because the mean of its divisors is an integer number (4989036).

Almost surely, 2^20723679 is an apocalyptic number.

20723679 is a deficient number, since it is larger than the sum of its proper divisors (9210537).

20723679 is a wasteful number, since it uses less digits than its factorization.

20723679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302637 (or 2302634 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 20723679 is about 4552.3267677090. The cubic root of 20723679 is about 274.6769937585.

The spelling of 20723679 in words is "twenty million, seven hundred twenty-three thousand, six hundred seventy-nine".