20427646 has 8 divisors (see below), whose sum is σ = 30663360. Its totient is φ = 10206528.

The previous prime is 20427643. The next prime is 20427647. The reversal of 20427646 is 64672402.

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

It is a super-2 number, since 2×20427646² = 834577442202632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20427643) 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, 1075 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (3832920).

Almost surely, 2^20427646 is an apocalyptic number.

20427646 is a deficient number, since it is larger than the sum of its proper divisors (10235714).

20427646 is a wasteful number, since it uses less digits than its factorization.

20427646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7298.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 20427646 is about 4519.6953437151. The cubic root of 20427646 is about 273.3628169002.

The spelling of 20427646 in words is "twenty million, four hundred twenty-seven thousand, six hundred forty-six".