20169947 has 8 divisors (see below), whose sum is σ = 23199456. Its totient is φ = 17177472.

The previous prime is 20169943. The next prime is 20169949. The reversal of 20169947 is 74996102.

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 20169947 - 2² = 20169943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20169947.

It is not an unprimeable number, because it can be changed into a prime (20169943) 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, 8078 + ... + 10275.

It is an arithmetic number, because the mean of its divisors is an integer number (2899932).

Almost surely, 2^20169947 is an apocalyptic number.

20169947 is a deficient number, since it is larger than the sum of its proper divisors (3029509).

20169947 is a wasteful number, since it uses less digits than its factorization.

20169947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18517.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20169947 is about 4491.0964140174. The cubic root of 20169947 is about 272.2084393842.

The spelling of 20169947 in words is "twenty million, one hundred sixty-nine thousand, nine hundred forty-seven".