20163729 has 16 divisors (see below), whose sum is σ = 27961920. Its totient is φ = 12909120.

The previous prime is 20163707. The next prime is 20163739. The reversal of 20163729 is 92736102.

It is not a de Polignac number, because 20163729 - 2⁵ = 20163697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20163696 and 20163705.

It is not an unprimeable number, because it can be changed into a prime (20163739) 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, 19239 + ... + 20259.

It is an arithmetic number, because the mean of its divisors is an integer number (1747620).

Almost surely, 2^20163729 is an apocalyptic number.

20163729 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20163729 is a deficient number, since it is larger than the sum of its proper divisors (7798191).

20163729 is a wasteful number, since it uses less digits than its factorization.

20163729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20163729 is about 4490.4041020826. The cubic root of 20163729 is about 272.1804643308.

The spelling of 20163729 in words is "twenty million, one hundred sixty-three thousand, seven hundred twenty-nine".