20169745 has 8 divisors (see below), whose sum is σ = 24794280. Its totient is φ = 15742080.

The previous prime is 20169731. The next prime is 20169749. The reversal of 20169745 is 54796102.

It can be written as a sum of positive squares in 4 ways, for example, as 1774224 + 18395521 = 1332^2 + 4289^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20169745 - 2⁵ = 20169713 is a prime.

It is a super-2 number, since 2×20169745² = 813637226730050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20169745.

It is not an unprimeable number, because it can be changed into a prime (20169749) 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, 48990 + ... + 49399.

It is an arithmetic number, because the mean of its divisors is an integer number (3099285).

Almost surely, 2^20169745 is an apocalyptic number.

It is an amenable number.

20169745 is a deficient number, since it is larger than the sum of its proper divisors (4624535).

20169745 is an equidigital number, since it uses as much as digits as its factorization.

20169745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98435.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20169745 is about 4491.0739250206. The cubic root of 20169745 is about 272.2075306678.

The spelling of 20169745 in words is "twenty million, one hundred sixty-nine thousand, seven hundred forty-five".