20172046 has 8 divisors (see below), whose sum is σ = 30278664. Its totient is φ = 10079160.

The previous prime is 20172037. The next prime is 20172073. The reversal of 20172046 is 64027102.

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

It is a super-2 number, since 2×20172046² = 813822879652232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1896 + ... + 6628.

It is an arithmetic number, because the mean of its divisors is an integer number (3784833).

Almost surely, 2^20172046 is an apocalyptic number.

20172046 is a deficient number, since it is larger than the sum of its proper divisors (10106618).

20172046 is a wasteful number, since it uses less digits than its factorization.

20172046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6866.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20172046 is about 4491.3300925227. The cubic root of 20172046 is about 272.2178815789.

Adding to 20172046 its reverse (64027102), we get a palindrome (84199148).

The spelling of 20172046 in words is "twenty million, one hundred seventy-two thousand, forty-six".