20246447 has 4 divisors (see below), whose sum is σ = 21803880. Its totient is φ = 18689016.

The previous prime is 20246399. The next prime is 20246453. The reversal of 20246447 is 74464202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20246447 - 2¹² = 20242351 is a prime.

It is a super-2 number, since 2×20246447² = 819837232247618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20246747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778697 + ... + 778722.

It is an arithmetic number, because the mean of its divisors is an integer number (5450970).

Almost surely, 2^20246447 is an apocalyptic number.

20246447 is a deficient number, since it is larger than the sum of its proper divisors (1557433).

20246447 is a wasteful number, since it uses less digits than its factorization.

20246447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557432.

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 20246447 is about 4499.6052049041. The cubic root of 20246447 is about 272.5521466851.

The spelling of 20246447 in words is "twenty million, two hundred forty-six thousand, four hundred forty-seven".