20729679 has 16 divisors (see below), whose sum is σ = 28600320. Its totient is φ = 13347360.

The previous prime is 20729633. The next prime is 20729699. The reversal of 20729679 is 97692702.

It is not a de Polignac number, because 20729679 - 2¹⁵ = 20696911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20729679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20729629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10209 + ... + 12069.

It is an arithmetic number, because the mean of its divisors is an integer number (1787520).

Almost surely, 2^20729679 is an apocalyptic number.

20729679 is a deficient number, since it is larger than the sum of its proper divisors (7870641).

20729679 is a wasteful number, since it uses less digits than its factorization.

20729679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 20729679 is about 4552.9857236763. The cubic root of 20729679 is about 274.7034997171.

The spelling of 20729679 in words is "twenty million, seven hundred twenty-nine thousand, six hundred seventy-nine".